Fertilization during mensuration.
According to the Nemours Foundation, ʺsometimes ovulation can occur before the bleeding from a girl's period has stopped or within a few days after her period is over. Sperm can fertilize an egg for several days after ejaculation. So in both cases, having sex during a girl's period can result in pregnancy.ʺ The American Pregnancy Association website confirmed the following information regarding pregnancy and your period: ʺPregnancy can occur from intercourse that takes place during a period. This is because sperm can live in the body for up to five days, and if a woman ovulates soon after her period, then conception could take place from intercourse that occurred during her period.ʺ