Just come to the time of intercourse is not pregnant, because this time the follicle is still very small, can not reach the advantageous state, from the advantageous state is still far away, so this time intercourse even if the sperm can successfully reach the fallopian tube localization, without the egg, then the sperm survival time is the longest 3 days, 3 days after the sperm will die, so this time intercourse is not pregnant. However, it is also recommended not to have intercourse during menstruation, because after all, during menstruation is the bleeding caused by the shedding of the uterine lining, and if you have intercourse, it is possible to cause pathogenic bacteria to enter the uterine cavity and cause inflammation of the uterine lining, so it’s recommended not to have intercourse during menstruation. In addition, coitus during menstruation may cause the uterus to contract, which will cause menstrual blood to travel along the fallopian tubes and into the pelvic cavity, resulting in the possibility of endometriosis.