Menstruation bumping red is a folk saying that refers to the time when men and women have intercourse and women happen to be in their menstrual period. The first day of menstruation hit the red first to stop sex, and then observe the female body condition, no abnormalities generally do not need to deal with. Feeling a small stomach distension, back pain, and the usual menstrual pain is not the same, you can take some antibiotics appropriately. During menstruation the cervical opening of the female is open, this time have sex easily lead to pelvic infection, if you do not know the menstruation to come, have sex on the first day of menstruation, found bleeding need to stop sex immediately, pay attention to observe the physical condition, most women vaginal defense function, there will rarely be symptoms occur. However, some women if the body resistance drops in this period of time, germs are easy to enter the reproductive tract, small stomach swelling, lumbago and other symptoms, so you need to take some antibiotics, such as cefuroxime, etc., to prevent uterine infections, such as cefuroxime, etc., the use of specific drugs need to be carried out under the guidance of the doctor.