Fertility Myths Debunked: 15 Common Misconceptions About Getting Pregnant

When you are trying to conceive, advice comes from every direction — family, friends, social media, the internet, and well-meaning strangers. Some of it is sound. Much of it is not. Fertility mythology is remarkably persistent, partly because conception is a topic laden with emotion and vulnerability, and partly because many myths contain a kernel of truth that gets distorted over time. Believing fertility myths can lead couples to delay seeking proper medical help, pursue ineffective interventions, or feel unwarranted guilt and anxiety. In this article, we systematically debunk 15 of the most common fertility myths using current scientific evidence — so you can focus your energy on what actually works.

Myths About Timing and Intercourse

Myth 1: You can get pregnant on any day of your cycle.
This is one of the most widespread misconceptions about conception, and it has two unfortunate effects: couples who believe it may either worry unnecessarily about conception from poorly timed intercourse, or assume that intercourse at any time is equally effective when trying to conceive.

The reality is that conception requires a living egg and viable sperm to be present in the fallopian tube at the same time. A woman's egg survives for only 12–24 hours after ovulation. Sperm, however, can survive in fertile cervical mucus for up to 5–6 days. This gives a conception window of approximately 6 days per cycle — the five days leading up to ovulation and the day of ovulation itself. After ovulation, the window closes rapidly. The most fertile days are the two days before and the day of ovulation, with pregnancy probability declining sharply from the day after.

Outside this window — particularly in the days immediately after ovulation and most of the pre-ovulatory phase — conception from intercourse is essentially impossible. This is not to say that couples should only have sex during the fertile window, but when timing intercourse specifically to maximise conception probability, the fertile window is what matters.

Myth 2: You should have sex as frequently as possible to maximise conception chances.
While frequent intercourse during the fertile window is beneficial, there is a commonly held belief that "more is always better" — that having sex multiple times daily will guarantee conception. This oversimplifies the relationship between ejaculation frequency, sperm quality, and conception.

Sperm concentration does decrease with very frequent ejaculation (multiple times per day), though the motility of freshly produced sperm is generally good. Conversely, very prolonged abstinence (more than 5–7 days) increases the proportion of older sperm with higher DNA fragmentation, even if total count is higher. The research consensus suggests that intercourse every 1–2 days during the fertile window optimises the combination of sperm concentration, motility, and freshness. Daily intercourse during the fertile window is also effective. Having sex multiple times daily is unlikely to significantly improve outcomes over daily intercourse and may create unnecessary pressure.

Myth 3: Certain sexual positions help sperm reach the egg faster.
One of the most persistent fertility myths is that specific positions — particularly lying with the hips elevated after intercourse, or using a "conception position" such as missionary with hips raised — improve the chances of conception. This is not supported by scientific evidence.

Within seconds of ejaculation, sperm begin swimming actively through cervical mucus. Within minutes, sperm have reached the cervix and some have entered the uterine cavity. Research tracking sperm movement shows that positioning of the body after ejaculation does not meaningfully affect how many sperm reach the cervix and uterus. Sperm are not passive passengers sliding with gravity — they are active swimmers that navigate the female reproductive tract through chemotaxis (following chemical signals from the egg) and rheotaxis (swimming against fluid currents). While lying still for a few minutes after intercourse is harmless and may feel intuitive, there is no evidence that inverting the body, using pillows under the hips, or any other position-related manoeuvre materially improves conception chances.

Myths About Female Fertility

Myth 4: If your periods are regular, you are definitely fertile.
Regular menstrual cycles are reassuring and do suggest that ovulation is likely occurring — but they do not guarantee fertility. Several significant fertility factors can be present even in women with textbook 28-day cycles:

• Poor egg quality due to age, particularly from the mid-30s onward, occurs independently of cycle regularity
• Endometriosis can affect tubal function, egg quality, and implantation without necessarily disrupting cycle regularity
• Structural problems such as blocked fallopian tubes (often from prior STI or pelvic inflammatory disease) can prevent conception despite regular ovulation
• Diminished ovarian reserve (declining egg supply) can be present in women with regular cycles, particularly in cases of premature ovarian insufficiency
• Male factor infertility has nothing to do with the female partner's cycle regularity

Regular periods are one positive indicator of reproductive health, but a normal cycle is neither necessary nor sufficient to confirm fertility in any given individual. If you have been trying to conceive for 12 months without success (6 months if over 35) despite regular cycles, fertility evaluation is appropriate.

Myth 5: Women can get pregnant easily well into their late 30s and 40s because celebrities do it all the time.
Media representation of celebrity pregnancies in the late 30s and 40s creates a dramatically distorted picture of age-related fertility decline. What is not shown is how many of these pregnancies result from donor eggs, IVF with their own younger eggs (frozen in their 20s or early 30s), or IVF cycles that required multiple attempts.

The science of age and female fertility is clear and non-negotiable. Women are born with all the eggs they will ever have — approximately 1–2 million at birth, declining to around 300,000 at puberty and perhaps 25,000 by age 37. Beyond quantity, egg quality declines because the genetic machinery that ensures eggs have the correct number of chromosomes (the meiotic spindle) becomes less reliable with age. By age 40, more than half of a woman's eggs may be chromosomally abnormal, which is why miscarriage rates rise steeply after 40 (from approximately 15% at age 30 to over 40% at age 42).

Per-cycle conception probability falls from approximately 20–25% at age 25 to 5–10% at age 40. This is not a reason for panic, but it is important context for family planning decisions. Women who wish to have children and are not yet in a position to do so may wish to consider egg freezing (oocyte cryopreservation) in their late 20s or early 30s to preserve younger, higher-quality eggs for future use.

Myth 6: You need to track your basal body temperature (BBT) for months before you can conceive.
BBT charting is a legitimate method for identifying when ovulation has occurred — a temperature rise of approximately 0.2°C indicates that ovulation happened in the preceding day or two, confirmed by 3 consecutive elevated readings. This is useful for understanding your cycle pattern over time but has an important limitation: by the time the temperature rises, ovulation has already happened. BBT charting tells you when you ovulated in retrospect, not in advance.

For maximising conception chances, the pre-ovulatory fertile window (the 5 days before ovulation) is more valuable than confirmation of ovulation after the fact. This is why urinary LH surge detection (ovulation predictor kits, OPKs) is generally more actionable for timing intercourse — the LH surge peaks approximately 24–36 hours before ovulation, giving advance notice to time intercourse optimally. BBT charting can identify cycle patterns over several months to help predict when ovulation is likely in future cycles, which can then guide OPK use. Neither approach requires months of data before trying — you can use OPKs from your very first cycle of actively trying.

Myths About Male Fertility

Myth 7: Male fertility is not affected by age.
While it is true that men can father children at advanced ages (unlike women, who experience menopause), male fertility does decline significantly with age — the decline is just more gradual than in women. Research published in Fertility and Sterility has shown that after age 40, men experience measurable declines in sperm motility and morphology, increases in sperm DNA fragmentation, and reduced fertilisation potential. Studies have shown that couples where the male partner is over 45 take significantly longer to conceive than younger couples, even controlling for the female partner's age.

Importantly, older sperm accumulate more de novo mutations (spontaneous genetic errors not inherited from the parents' germline). These mutations accumulate in sperm stem cells at a rate of approximately 2 additional mutations per year after age 20. Children of older fathers have higher rates of certain conditions including autism spectrum disorder, schizophrenia, and specific rare genetic disorders. The term "paternal age effect" describes these age-related genetic risks. This does not mean that older men should not have children — millions of healthy children are born to fathers over 40 every year — but the myth that male fertility is ageless is demonstrably false.

Myth 8: If a man has fathered children before, his fertility is fine now.
Prior paternity is reassuring but is not a guarantee of current fertility. Male fertility changes over time and can be significantly impacted by subsequent events including: development of a varicocele (enlarged scrotal veins); testicular injury or infection; new medication use (including anabolic steroids, certain antifungals, or chemotherapy); systemic illness; significant weight gain; and simply the passage of time and associated ageing. A man who fathered a child at 30 and is now 40 with a new partner may have meaningfully different sperm parameters than a decade earlier. When a couple is struggling to conceive and the male partner has prior paternity, a current semen analysis is still warranted — it is quick, inexpensive, and provides current data rather than relying on historical inference.

Myth 9: Wearing tight underwear is just a minor factor — not a real fertility issue.
The relationship between scrotal temperature and sperm production is well-established biology, not an old wives' tale. Spermatogenesis requires temperatures 2–4°C below core body temperature — which is precisely why the testes are located outside the body in the scrotum. The cremaster muscle and pampiniform plexus (a venous plexus around the spermatic cord) work together to regulate scrotal temperature through contraction and relaxation.

A 2018 study from Harvard Medical School found that men who wore loose-fitting underwear (boxer shorts) had 25% higher sperm concentration and 17% higher total sperm count than men who wore tight underwear. The mechanism is straightforward: tight underwear holds the testes closer to the body, raising scrotal temperature. While this is unlikely to cause infertility in a man with otherwise excellent parameters, it is a meaningful variable for men with already borderline counts or motility. Given that changing underwear style costs nothing and carries no downside, it is a sensible recommendation for men trying to conceive.

Myths About Stress, Lifestyle, and Supplements

Myth 10: "Just relax and you'll get pregnant" — stress is the main cause of infertility.
This is perhaps the most unhelpful myth surrounding fertility, because it places blame on the couple for not being relaxed enough, creates additional guilt and pressure, and can delay appropriate medical investigation. While psychological stress does have measurable physiological effects on reproductive hormones (chronic stress raises cortisol, which can suppress GnRH and thereby reduce FSH and LH signalling, potentially impairing ovulation and spermatogenesis), stress is rarely, if ever, the sole cause of infertility.

In couples who conceive naturally, some do experience temporary improvements in fertility after reducing stress — but often because reducing stress also leads to healthier behaviours (better sleep, diet, exercise) or because the stress reduction coincides with medical treatment. Couples who have not conceived after 12 months have, in most cases, an underlying physiological factor — ovulatory dysfunction, tubal disease, male factor infertility, uterine anomaly, or unexplained infertility — that will not resolve through relaxation alone. The advice to "just relax" can cause real harm by leading couples to delay the evaluation and treatment that could help them.

Myth 11: A healthy diet makes fertility supplements unnecessary.
Diet is the foundation of fertility nutrition, and a truly comprehensive, high-quality diet does reduce the need for supplementation. However, several lines of evidence suggest that supplementation remains valuable even for those eating well:

First, the nutrient demands of fertility and early pregnancy — particularly for folate, iron, vitamin D, iodine, and omega-3 DHA — are difficult to meet through diet alone for many people. Folate is the clearest example: the neural tube closes within the first 28 days of pregnancy — before most women know they are pregnant — making pre-conception folate supplementation critical, as few women consume sufficient folate through diet alone to reach the recommended blood folate levels needed to prevent neural tube defects.

Second, specific fertility-supporting nutrients — particularly CoQ10 (which declines with age) and D-chiro-inositol/myo-inositol (which may be metabolised differently in PCOS) — are difficult to obtain in clinically meaningful quantities from food. Third, cooking and food processing reduce nutrient density; the vitamin and mineral content of foods today is lower than in past decades due to soil depletion.

This is not to suggest that supplementation can compensate for a poor diet — it cannot. But a comprehensive prenatal supplement containing methylfolate, iron, iodine, vitamin D, omega-3 DHA, and a full B-complex is a valuable safety net for any woman trying to conceive, regardless of the quality of her diet. Targeted additions (CoQ10, myo-inositol for PCOS, extra vitamin D if deficient) provide additional support where evidence supports it.

Myth 12: IVF always works — it's just a matter of trying enough cycles.
IVF is a remarkable medical achievement that has helped millions of people become parents. However, it is not a guaranteed solution, and treating it as an unlimited retry option can create unrealistic expectations and significant financial and emotional strain. IVF success rates vary enormously by age, diagnosis, clinic, and individual biology. For women under 35 with good ovarian reserve and no severe additional factors, live birth rates per cycle at leading centres can reach 40–50%. For women over 42 using their own eggs, per-cycle live birth rates typically fall below 10–15%, even at the best clinics.

Cumulative success rates across multiple cycles are better than single-cycle rates, which is why most guidelines suggest considering 2–3 complete cycles before reassessing prognosis. However, beyond a certain point — particularly in older women with diminished ovarian reserve or repeated implantation failure — the evidence does not support continuing indefinitely with the same approach. Egg donation, which uses eggs from a younger donor, offers significantly higher success rates for women where egg quality is the primary barrier. Accepting the limits of IVF and understanding when to pivot — with the help of a compassionate and honest medical team — is an important part of navigating this journey.

Myth 13: Secondary infertility is not real — if you got pregnant once, you'll get pregnant again.
Secondary infertility — difficulty conceiving or carrying a pregnancy after having already had one or more successful pregnancies — is a genuine and surprisingly common condition, affecting approximately 1 in 7 couples trying for a second child. It can be deeply confusing and isolating for those experiencing it, partly because of the widespread myth that prior successful pregnancy guarantees future fertility.

Many conditions can develop or worsen between pregnancies: uterine abnormalities (fibroids, adhesions from a previous caesarean section), endometriosis progression, fallopian tube damage from a prior pregnancy-related infection, new male factor issues, significant age-related decline (particularly if several years have elapsed), and thyroid or other hormonal changes. Secondary infertility deserves the same thorough evaluation and compassionate care as primary infertility. Couples experiencing it should not be dismissed with reassurances based on prior success — they should be investigated and treated with the same seriousness as any couple struggling to conceive.

Myths About Conception and Pregnancy

Myth 14: If you miscarry, it means something is wrong with your ability to carry a pregnancy.
Miscarriage is heartbreakingly common — approximately 15–20% of confirmed pregnancies end in miscarriage, and the true rate (including very early losses before a missed period) is higher still. The vast majority of miscarriages — approximately 60–70% of first-trimester losses — are caused by random chromosomal abnormalities in the embryo, specifically aneuploidy (extra or missing chromosomes) resulting from errors in egg or sperm meiosis. These are one-time events: the next embryo is not destined to be abnormal simply because the previous one was.

A single miscarriage does not indicate a problem with a woman's ability to sustain a pregnancy. Even two miscarriages may be coincidental — the probability of having two consecutive random chromosomal losses is not negligible, particularly in women over 35. Investigation is typically recommended after three consecutive miscarriages (recurrent pregnancy loss), at which point structural causes (uterine anomalies), clotting disorders (antiphospholipid syndrome), thyroid dysfunction, and parental chromosomal rearrangements are evaluated. Most couples who have experienced miscarriage do go on to have successful pregnancies, often without any specific treatment for the miscarriage itself.

Myth 15: Fertility supplements and "fertility superfoods" can reverse age-related decline.
The supplement and functional food industry has enthusiastically capitalised on the anxiety of people trying to conceive, marketing various products as capable of "reversing the biological clock" or dramatically improving egg quality in older women. The reality is more nuanced. Nutritional supplementation can support the conditions under which eggs and sperm develop, reduce oxidative damage, and correct nutritional deficiencies that impair fertility. This is meaningful and evidence-supported.

However, no supplement can restore the ovarian reserve that has already been lost, repair chromosomally abnormal eggs, or fundamentally reverse the age-related changes in egg quality. CoQ10 has the strongest evidence among supplements for supporting mitochondrial function in ageing eggs, but clinical trial data show modest improvements in IVF parameters — not a wholesale reversal of age-related decline. Similarly, myo-inositol can improve the hormonal environment in PCOS without curing the underlying syndrome. "Fertility superfoods" like bee pollen, maca root, and royal jelly lack rigorous clinical evidence supporting their effectiveness in humans. The most evidence-based nutritional support for fertility comes from a combination of a quality prenatal supplement, CoQ10 (especially for women over 35), omega-3 DHA, and correction of any identified deficiencies — not exotic superfoods marketed with extravagant claims.

Frequently Asked Questions About Fertility Myths

Is it true that you're more fertile after stopping the pill?
This is a half-truth. After stopping oral contraceptives, fertility typically returns quickly — often within the first or second natural cycle. There is no evidence that the pill causes long-term fertility impairment. Some women experience a brief "rebound" with a slightly higher chance of twin conception in the first cycle (due to multiple ovulations as the body adjusts), but this is transient. If periods do not return within 3 months of stopping the pill, this may indicate an underlying hormonal issue (such as hypothalamic amenorrhoea or PCOS) that the pill was masking rather than causing. Women who had irregular cycles before starting the pill should not assume the pill "regulated" their cycles — their underlying irregularity may return when they stop, and this warrants evaluation if they are trying to conceive.

Does eating pineapple core after embryo transfer help implantation?
The pineapple core implantation theory is based on bromelain — an enzyme found in pineapple core — which has anti-inflammatory properties. The theory suggests that eating pineapple core in the days after embryo transfer reduces uterine inflammation and promotes implantation. There is no clinical evidence that this works. Bromelain is largely inactivated by stomach acid before it could reach the uterus in any meaningful concentration. While eating pineapple is harmless (and delicious), relying on it as a fertility intervention has no scientific basis. The good news is that doing harmless things that make you feel proactive and hopeful during the two-week wait is not objectively harmful — just don't substitute it for evidence-based care.

Can a woman "save" her fertility by living a healthy lifestyle?
Healthy lifestyle choices unambiguously support fertility and reproductive health — they reduce the risk of ovulatory dysfunction, maintain hormonal balance, protect egg quality from oxidative damage, and support healthy sperm production in male partners. However, lifestyle cannot halt the fundamental biological process of ovarian ageing. The number of eggs a woman has cannot be increased by any lifestyle intervention, diet, or supplement. What healthy living can do is: slow the rate of egg quality decline that is influenced by oxidative stress and inflammation; improve the hormonal environment for the eggs that remain; and optimise overall health for conception and pregnancy. Healthy choices matter — but they have limits, and women should not be led to believe that healthy living alone will fully preserve fertility against the passage of time.

Is it true that having an orgasm helps conception?
The "uterine upsuck" theory — that uterine contractions during female orgasm draw sperm toward the egg — has been discussed in reproductive biology for decades but remains unproven. Some studies have suggested that orgasm may facilitate sperm transport through muscular contractions of the uterus; others have found no effect. Even if there is a slight effect on sperm transport, it is unlikely to be the determining factor in conception given the enormous numbers of sperm reaching the reproductive tract after intercourse. There is certainly no harm in prioritising mutual pleasure during intercourse, and a natural, relaxed sexual experience may support healthy lubrication and a more positive experience — but couples should not feel that the female partner's orgasm is a clinical requirement for conception.

Should I avoid all caffeine when trying to conceive?
The evidence on caffeine and fertility is nuanced. High caffeine intake (more than 300–400 mg daily, roughly 3–4 cups of coffee) has been associated in some studies with longer time-to-pregnancy and a modestly increased risk of miscarriage. Most fertility guidelines recommend limiting caffeine to under 200 mg/day (approximately 1–2 cups of coffee) when trying to conceive and during pregnancy. Moderate caffeine consumption below this threshold does not appear to significantly impair fertility for most people. Completely avoiding caffeine is a personal choice that may make some people feel more in control, but the evidence does not support it as a strict requirement — and the benefit of reducing from moderate to zero intake is likely small compared to more impactful interventions like dietary quality, maintaining healthy weight, and taking appropriate supplements.