Ovulation Tracker
Estimate your fertile window and ovulation day for family planning. Includes a visual calendar showing your peak fertility days.
Frequently Asked Questions
When do I ovulate during my menstrual cycle?
Ovulation typically occurs 14 days before the start of your next period — not necessarily on day 14 of your cycle. For a 28-day cycle, that is day 14. For a 35-day cycle, it is around day 21. For a 21-day cycle, day 7. The 14-days-before-next-period rule is more reliable than counting from the start of your period, as the post-ovulation (luteal) phase is consistently 12–16 days for most women.
How long does the egg survive after ovulation?
The released egg is viable for only 12–24 hours after ovulation. However, sperm can survive in cervical mucus and the fallopian tubes for up to 5 days. This is why the fertile window is 6 days (5 before ovulation + the day of ovulation) — having sex 3–4 days before ovulation can still result in pregnancy.
What are the physical signs of ovulation?
Ovulation signs include: cervical mucus becomes clear, slippery, and stretchy (similar to raw egg white) — this is the most fertile sign. Basal body temperature (BBT) rises by 0.2–0.5°C after ovulation and stays elevated. A brief one-sided lower abdominal pain (Mittelschmerz) affects ~20% of women. LH surge detected by ovulation predictor kits (OPKs) 24–36 hours before ovulation.
How can I track ovulation accurately?
Most reliable methods: ovulation predictor kits (OPKs) detect the LH surge 24–36 hours before ovulation — accuracy ~99% for detecting the surge. Basal body temperature (BBT) charting confirms ovulation has occurred (temperature rises after the event). Fertile cervical mucus observation. Transvaginal ultrasound (used in fertility clinics) is the gold standard. Cycle tracking apps alone (calendar method) have the lowest reliability for irregular cycles.
Is this ovulation tracker accurate enough for contraception?
No. Calendar-based fertility awareness is not reliable contraception — typical use failure rate is 24% per year (1 in 4 women becomes pregnant within a year). It should not be used as birth control unless combined with cervical mucus and BBT tracking (symptothermal method), proper training, and consistent practice. Even then, it is less effective than hormonal or barrier contraception. Consult a healthcare provider for contraceptive advice.