If you have been bleeding for four days after your period, you need to find out the cause of the bleeding and give targeted treatment. If the bleeding is not very heavy, it may be caused by cervical lesions or endometrial polyps or fibroids, and a vaginal ultrasound is needed to rule out organic lesions. If ultrasound and gynecological examination reveal no abnormality, endocrine disorder should be considered as the cause because at this time if the menstrual cycle is short, it may be ovulatory bleeding. In addition, hormonal imbalance in the body can also occur. In this case, you can take hemostatic medication under the guidance of a doctor and observe the amount of bleeding. If the bleeding is very heavy with large clots, diagnostic scraping is required and the scraped out tissue will be sent for pathological laboratory tests.