What ovulation is
Ovulation is the release of a mature egg from one of your ovaries. Once released, the egg travels into the fallopian tube, where it can be fertilised by sperm. It's the central event of your menstrual cycle and the reason there's a fertile window each month.
The egg only survives for about 12 to 24 hours after it's released, which is why timing is so important when you're trying to conceive.
When ovulation happens
In a textbook 28-day cycle, ovulation happens around day 14 — roughly the middle. But cycles vary, and so does the timing. A more reliable rule is that ovulation tends to occur about 12 to 16 days before your next period starts, regardless of your cycle length.
So if your cycles are shorter or longer than 28 days, your ovulation day shifts accordingly. Irregular cycles make it harder to pin down.
Your fertile window
Because sperm can survive for up to about five days, your fertile window is the roughly six days ending on the day of ovulation. Having sex in the few days leading up to ovulation gives the best chance of conception. This is why understanding your ovulation timing helps whether you're trying to conceive or to avoid it.
If your cycles are irregular or you're having trouble working out your fertile window, a GP can help — with tracking advice, blood tests to confirm ovulation, and a plan. A telehealth consult is an easy place to start.
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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