How can you get pregnant if on period?

It is unlikely to get pregnant while on your period, but it is not impossible. Menstruation usually involves the shedding of the uterine lining as well as an egg that was not fertilized during the previous menstrual cycle. If ovulation, or the release of an egg from the ovary, occurs close to the end of menstruation or if sperm remains active in the reproductive tract from before menstruation began, there is a slight chance of pregnancy. Menstrual cycles vary in length, and factors such as stress, hormonal imbalances, or certain medications can cause ovulation during periods, thus, it is crucial to take necessary precautions.