Understanding Ovulation and the Fertile Window
Ovulation is the release of a mature egg from the ovary, which can then be fertilised by sperm. It typically occurs once per menstrual cycle, around the middle of the cycle. For a typical 28-day cycle with a 14-day luteal phase, ovulation occurs on approximately day 14. The fertile window spans about 6 days: the five days before ovulation and the day of ovulation itself. Sperm can survive in the female reproductive tract for up to 5 days, making intercourse in the days leading up to ovulation effective for conception. The egg is viable for only 12–24 hours after release. Understanding your cycle helps identify your personal fertile window, which varies based on your individual cycle length and luteal phase duration.
Frequently Asked Questions
How reliable is the ovulation calculator?
This calculator provides an estimate based on average cycle patterns. It is most reliable for women with regular cycles. Stress, illness, travel, and hormonal changes can shift ovulation timing. For greater accuracy, track basal body temperature (BBT) or use LH ovulation predictor kits (OPKs).
What are the signs of ovulation?
Common signs include: clear, slippery, egg-white cervical mucus; a slight rise in basal body temperature (0.2–0.5°C); mild one-sided pelvic pain (Mittelschmerz); light spotting; breast tenderness; and an elevated LH surge detectable by OPK strips.
Can I get pregnant outside the fertile window?
Technically possible but very unlikely. Sperm can survive up to 5 days, and the egg is viable for only 12–24 hours. Intercourse within the 6-day fertile window (5 days before ovulation and ovulation day) accounts for virtually all natural pregnancies.