How ovulation is estimated
Ovulation usually happens about 14 days before your next period starts. With a 28-day cycle that's around day 14; with a 32-day cycle it's around day 18.
Ovulation day ≈ First day of last period + (cycle length − 14)
Sperm can survive up to about five days, and an egg lives about a day after ovulation, so the fertile window runs from about five days before ovulation through the day after.
Signs of ovulation
- Clear, stretchy cervical mucus, similar to raw egg white.
- A small rise in basal body temperature after ovulation.
- A positive result on an ovulation (LH) test strip.
Frequently asked questions
When should I take a pregnancy test?
Most home tests are most reliable from the first day of a missed period, about two weeks after ovulation.
What if my cycles are irregular?
Calendar estimates are less accurate. Ovulation test strips or tracking temperature and cervical mucus can help, and a doctor can check for an underlying cause.