There are more reasons for bleeding again a week after menstruation, including drug use, abnormal shedding of the endometrium, ovulatory bleeding, cervical bleeding, etc. I. The use of hormonal drugs may cause abnormal shedding of the endometrium, for example, withdrawal bleeding will occur in about a week after the use of emergency contraceptives, which is a normal physiological reaction. Second, the endometrium is affected by the external environment, such as strenuous exercise, frequent sex, and violent mood swings, etc., which may cause a small amount of endometrial shedding. Ovulatory bleeding. After women enter ovulation, the hormone level in the body changes, which may lead to hormone failure to maintain the normal proliferation of the endometrium, thus causing a small amount of endometrial shedding. Cervical and vaginal lesions may cause a small amount of bleeding in women, which can be examined and treated through colposcopy.