After the menstrual period clean within three days of intercourse will not be pregnant, because this period is not ovulation, generally is the regular menstrual cycle, in the next menstrual period before the blood of the 14th day for the day of ovulation, before and after the day of ovulation within 4-5 days of coitus, the chances of pregnancy is relatively large. Three days after menstruation is the time when the follicles are in the stage of growth, intercourse will not get pregnant. Although ovulation is sometimes affected by emotions, environment, drugs and other influences, early ovulation or extra ovulation, but the chances are very small, but it is generally recommended to wait until the menstrual blood is completely clean before having sex. If there is sexual contact during the period of menstrual bleeding, it is easy to lead to women’s menstrual blood reflux and inflammation of women’s vagina, uterus and pelvis, etc. Therefore, during the period of menstrual bleeding, we should take rest as the main focus, change underwear and sanitary products diligently, and we can wash the vulva with lukewarm water to keep the vulva clean and dry.