Conception & Ovulation Calculator
Ovulation usually happens about 14 days before the next period starts. The fertile window is the five days leading up to ovulation and the day after.
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The math behind it: Pregnancy Conception
ovulation = first day of last period + (cycle length - 14)
Sperm can survive for up to five days, and an egg for about a day, which is where the six-day window comes from. Cycle lengths vary from month to month, so the dates are estimates.
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