Use this tool to calculate your fertile window, track your periods, and estimate the best time to get pregnant. Simply enter the first day of your last period and your average cycle length.
Ovulation usually occurs around 14 days before your next period. Your most fertile days are the 5 days before ovulation and the day after. This calculator estimates your fertile window using this pattern.
For most women, period days and fertile days don't overlap. But in certain cases, such as short cycles or long periods, ovulation may begin during or shortly after menstruation. This can cause the fertile window to overlap with the tail end of your period.
While rare, pregnancy is possible if you have sex at the end of your period and ovulate early. Sperm can live inside the body for up to 5 days, so an early ovulation could lead to conception even from intercourse during menstruation.
Always consult with a healthcare provider for personalized advice. This tool is meant for educational purposes only.