You can’t get pregnant by having intercourse during your period, but intercourse during your period can have a very serious impact on a woman’s body. During menstruation means that there is no ovulation and hormone levels are low, so having intercourse during this time will not result in pregnancy. Having intercourse during menstruation can cause bacterial infection and may cause abnormal contractions of the uterus, resulting in backflow of menstrual blood. The menstrual blood may enter the abdominal cavity along the bilateral fallopian tubes, which contains a large amount of endometrium, and if it enters the abdominal cavity, it may cause endometriosis and ovarian cysts, which can have serious effects on future pregnancies and may also lead to chronic pelvic pain.