Trying to conceive: the fertile window, timing, and how long it should take

The fertile window

Sperm survive up to five days; an egg survives around a day. So the fertile window is the five days before ovulation and the day itself, and the highest-chance days are the two or three immediately before ovulation.

Ovulation happens roughly 14 days before the next period — so in a 28-day cycle around day 14, in a 32-day cycle around day 18. Counting forward from the last period is the commonest error.

The simplest effective plan needs no tracking at all: have sex every two to three days through the cycle. It covers the window without turning conception into an appointment, and it keeps sperm quality steady.

How long it normally takes

About 8 in 10 couples conceive within a year of regular unprotected sex, and around 9 in 10 within two years. Roughly a quarter conceive in the first month.

This means several months without a pregnancy is normal and is not evidence of a problem. It also means a year of trying without success is the point at which to seek assessment — earlier at 35 and above.

Age matters for both partners. Female fertility declines gradually through the thirties and more sharply after 37; male fertility declines more slowly but genuinely. Neither is a reason to panic, and both are a reason to seek advice earlier rather than later if you are over 35.

What actually improves the odds

Both partners: stop tobacco in every form including chewed tobacco, cut alcohol, get to a healthy weight (both very low and very high weight affect fertility), sleep properly, and treat chronic conditions — thyroid, diabetes, blood pressure — to a stable point.

For the woman: folic acid at least a month before conceiving, treatment of anaemia, and a check of thyroid, sugar and rubella immunity. See our preconception checklist for the full list.

For the man: keep the testes cool — no long hot baths, saunas, laptops on the lap or extended tight clothing; avoid anabolic steroids entirely; and get a semen analysis if there is any concern. Sperm take about three months to make, so changes take a season to show.

What does not help: lying with legs raised after sex (sperm reach the cervix within minutes), particular positions, avoiding sex to 'save up' sperm (daily to alternate-day sex is fine and abstinence beyond a few days does not improve quality), and expensive supplements without a diagnosed deficiency.

The Indian additions

Lubricants: most commercial lubricants impair sperm movement. If one is needed, ask for a fertility-friendly variety, or use less.

Traditional advice varies from harmless to costly. Foods, massages and rituals do no damage in themselves; what damages is the months spent on them instead of a semen analysis or a thyroid test when something is actually wrong.

The blame is worth naming. In India, difficulty conceiving is still routinely treated as the woman's failing, when male factors are involved in roughly 40 to 50 per cent of cases. The first investigation should always include a semen analysis — it is cheap, quick and non-invasive, and skipping it wastes months of the woman's investigations.

And the law: sex determination of a fetus is a crime under the PCPNDT Act, and any clinic offering sex-selection services, including 'gender selection' during fertility treatment, is acting illegally. Walk out.

When to see a doctor

Seek assessment after: 12 months of regular unprotected sex without conception if the woman is under 35; 6 months if she is 35 or older; and straight away at any age if there are irregular or absent periods, known PCOS or endometriosis, previous pelvic surgery or infection, two or more miscarriages, a history of undescended testes, testicular injury or surgery, or any difficulty with sex itself.

Same-day: severe pelvic pain, a missed period with one-sided pain and bleeding (possible ectopic pregnancy), or heavy bleeding with dizziness.

This article is general information, not medical advice, and is no substitute for personal medical advice. For any decision about your or your child's health, please consult your doctor.

Frequently asked questions

Q: How often should we have sex? — Every two to three days across the whole cycle is the simplest approach and works as well as timed intercourse, without the pressure. Daily during the fertile window is also fine.

Q: Should we buy ovulation kits? — They can help if cycles are irregular or if timing is genuinely uncertain — they detect the LH surge a day or so before ovulation. For most couples having regular sex, they add cost and stress rather than chances.

Q: Does stress prevent conception? — Severe stress can disrupt cycles, and the advice to 'just relax' is unhelpful and often untrue as a cause. Manage stress for your own sake; do not accept it as an explanation that replaces investigation.

Q: We conceived easily before and cannot now. — That is secondary infertility, it is common, and it deserves the same investigation as primary infertility. Do not let anyone tell you it cannot be a problem because you have a child already.