If you are actually menstruating and have sex and ejaculate inside your body, the probability of pregnancy is not very high because you are in a safe period when you are menstruating and basically not ovulating normally, so there is basically no possibility of pregnancy. However, some women may mistake abnormal bleeding as menstruation, such as bleeding during ovulation as menstruation, and internal ejaculation has a high probability of pregnancy, which is about 60%. If the bleeding is similar to the normal menstrual flow and the normal menstrual cramps, you will not get pregnant during intercourse, but the bleeding is not like a normal menstrual flow, but only spot bleeding or brown discharge, so there is still a possibility of pregnancy if you have sex without good contraception.