1. A small amount of bleeding during ovulation may be due to the fact that during ovulation, the estrogen level decreases slightly, leading to endometrial exfoliation and vaginal bleeding. 2, Malignant changes of the cervix or endometrium can also cause vaginal bleeding. When women have bleeding one week after menstruation, they should go to the hospital for gynecological examination, cervical TCT, sex hormone and gynecological ultrasound, and take corresponding medication or surgery according to different causes and locations.