Ovulation occurs approximately 14 days before your next period, the length of your cycle can change from month to month depending on things like stress or illness. The egg lives for about 1 day while sperm can live for about 3 to 5 days. Conception is most likely to occur when intercourse occurs in the 4 to 5 days before ovulation or on the day of ovulation.
So if she is late and has not had her period since you had sex, it's possible she may be pregnant. A home pregnancy test at this point could help detect this.
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