The official medical term for menstrual period is menstruation. Delayed menstruation without pregnancy Redness after intercourse may be fast approaching menstruation, or it may be caused by pregnancy and miscarriage or gynecological diseases and so on. 1. Fast approaching menstruation. Delayed menstruation 3 to 7 days is normal, such as checking the absence of pregnancy, bleeding red phenomenon after intercourse may be a sign of impending menstruation, due to a small amount of endometrial shedding caused by bleeding, and sexual intercourse has little to do with the first observation of the bleeding situation, the general amount of bleeding will gradually increase the formation of menstrual discharges. 2. Pregnancy and abortion. Delayed menstruation and red after intercourse, but also be alert to the performance of pregnancy and abortion, due to the short duration of pregnancy has not been measured pregnancy, the uterine contraction caused by the stimulation of intercourse and abortion symptoms, can be combined with the blood human chorionic gonadotropin HCG test to confirm the diagnosis. 3. Gynecological diseases. Delayed menstruation after coitus red, such as checking to exclude pregnancy and menstruation, is likely to be vaginitis or cervicitis, cervical polyps, cervical cancer and other diseases caused by contact bleeding, often accompanied by increased secretions, odor and other discomforts, can be combined with gynecological examination to confirm the diagnosis. In addition, redness after coitus may also be caused by ring stimulation, rough sex, etc., to improve the gynecological examination for specific causes of treatment.