This is a great question. Many people think that they cannot get pregnant if they have unprotected sex while on their period. In reality, pregnancy depends on ovulation- the process in which an egg is released. Ovulation can happen at any time during someone’s period, making pregnancy possible during the period.
Unless you are practicing the natural family planning method, it can be extremely difficult, if not impossible, to know when exactly you are ovulating.
With that being said, it’s important to say that pregnancy is possible whenever semen comes in contact with the vagina. If you are having unprotected sex, even if you are on your period, there is a risk for pregnancy. The length of time between the beginning of menstruation and ovulation can vary from month to month based upon a woman’s hormonal balance. In some people, ovulation can occur before menstrual bleeding has stopped, allowing that person to be fertile during their period.
Did you know that sperm can also survive inside the vagina for 2-3 days under normal conditions? If that person ovulates several days after bleeding has stopped, they may become pregnant from sperm left in the vaginal canal during intercourse. Many people may also experience bleeding during ovulation, which can be mistaken for menstruation. The best way to avoid pregnancy is to use forms of birth control consistently and correctly.