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An egg lives for about 12-24 hours after you ovulate, and sperm can live for five to seven days. Ideally, you need a lot of sperm on stand-by to 'pounce' on that egg when it's released, so have sex in the days leading up to when you ovulate and a day after.
To calculate your ovulation dates, we need to know the first day of your last period and your average cycle length. But on average, the ovum (egg) survives for 24 hrs after ovulation, and if itâs not fertilized, menstruation occurs after 12 to 14 days.