Fertility Awareness
Understanding the fertile window, and when difficulty conceiving warrants assessment.
Last revised
Key takeaways
- When to seek assessment: after 1 year, or 6 months if the woman is over 36
- Fertile window: roughly the 6 days ending on ovulation
- Most useful single change: Have regular sex through the cycle rather than timing precisely.
- Commonest mistake: Timing sex narrowly, which adds stress and little benefit.
- See a doctor if any of the signs under "When to get help" below apply to you.
Why it matters
Most couples conceive within a year, and the point of the thresholds is to avoid both premature and delayed investigation.
The numbers, in one place
| Measure | Figure |
|---|---|
| When to seek assessment | after 1 year, or 6 months if the woman is over 36 |
| Fertile window | roughly the 6 days ending on ovulation |
| Sex frequency commonly advised | every 2-3 days throughout the cycle |
| Male factor involvement | around 50 per cent of cases |
| Folic acid | start before conception, not after a positive test |
What helps
- Have regular sex through the cycle rather than timing precisely
- Start folic acid when you begin trying
- Ask for both partners to be assessed together
- Stop smoking and reduce alcohol; both affect fertility
What to avoid
- Timing sex narrowly, which adds stress and little benefit
- Investigating only the female partner
- Delaying assessment beyond the recommended thresholds
Where to go next
- Fertility Awareness: The Questions People Actually Ask
- The Short Guide to Fertility Awareness
- Consent and Healthy Relationships: What the Evidence Actually Says
- The Evidence on Sexual Health in Later Life, Without the Hype
When to get help
See a GP sooner than the usual thresholds if you have irregular or absent periods, known pelvic infection or endometriosis, previous cancer treatment, undescended testicles, or if the woman is over 36. Seek urgent care for severe one-sided pelvic pain in early pregnancy, which can indicate an ectopic pregnancy.
Where this comes from
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.