The 8-9 days of menstruation and coffee-colored discharge is an abnormality that may affect pregnancy, and the normal menstrual period is usually cleared within 7 days. Normal menstrual cycle is usually clean within 3-7 days, the cause of 8-9 days of menstruation and coffee-colored discharge may be due to estrogen insufficiency, endometrial repair is imperfect; or due to endometrial inflammation, endometrial polyps, adenomyosis, submucosal fibroids and so on, may lead to prolonged menstruation, coffee-colored discharge, etc., and all of the above reasons may affect the pregnancy. If the menstrual cycle is 8-9 days and there is still coffee-colored discharge, it is recommended to go to the hospital in time for a clear diagnosis of the cause of the disease, and the doctor will formulate an individualized diagnosis and treatment plan, so as to avoid affecting the therapeutic effect.