Your fertile window
Your fertile window is the handful of days each cycle when pregnancy is possible — approximately 5 days before ovulation and the day of ovulation itself. This is because sperm can survive for up to 5 days, but the egg only lives for about 24 hours after release.
Timing intercourse every 2–3 days throughout your cycle is a simple, effective approach. But if you want to pinpoint your fertile window more precisely, there are several methods you can use.
Methods for tracking ovulation
Cervical mucus monitoring: in the days leading up to ovulation, cervical mucus becomes clear, slippery, and stretchy (like egg whites). This is one of the most reliable free methods for identifying your fertile window.
Ovulation predictor kits detect the LH surge before ovulation. Basal body temperature charting tracks the small temperature rise (about 0.3°C) that occurs after ovulation — it confirms ovulation has happened but doesn't predict it in advance. Cycle tracking apps can help combine these methods.
When tracking isn't enough
If your cycles are irregular, tracking can be frustrating and less reliable. Conditions like PCOS can make ovulation unpredictable. If you've been trying for 12 months (or 6 months if you're over 35), see your GP for fertility investigations.
Your GP can arrange blood tests to check your hormone levels, confirm whether you're ovulating regularly, and refer you to a fertility specialist if needed. Tracking is helpful, but it's not a substitute for medical assessment if you're struggling to conceive.
Related condition
Fertility & trying to conceive →References & sources
- 1.Ovulation and fertility — Pregnancy Birth & Baby
- 2.Fertility — Pregnancy Birth & Baby
- 3.Planning for pregnancy — Pregnancy Birth & Baby
This content is general information and not a substitute for individual medical advice. Please consult a GP for your personal situation.
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