The fertile window is the few days each cycle when pregnancy is actually possible. Sperm can live in the reproductive tract for up to five days, while the egg survives for 24 hours after ovulation. That means the fertile window includes the five days leading up to ovulation and the day of ovulation itself. Having intercourse before or when the egg is relesed is the best plan - this means the top 2 days for intercourse are the day before and the day of ovulation. Ovulation does not always happen

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