Find your fertile window and most likely ovulation date.
Ovulation typically occurs 14 days before the next expected period. For a 28-day cycle that means day 14. For longer or shorter cycles, this shifts accordingly.
Sperm can survive in the reproductive tract for up to 5 days. An egg lives roughly 24 hours after release. Combined, your fertile window spans about 6 days: the 5 days before ovulation and the day of ovulation itself.
Cycle lengths vary month to month. This calculator provides an estimate based on average cycle length and is most useful for people with regular cycles.