If the vaginal bleeding occurs a few days after the coitus, it has nothing to do with the coitus itself, and the main consideration is that the endometrial changes caused by endocrine disorders cause the bleeding. There is no need to be nervous in this case, you can take oral medication to stop bleeding to deal with the symptoms. You can take Anluo blood tablets orally, 3 times a day, 5mg once, for 3 days, basically the bleeding will stop. If the bleeding still does not stop, it is recommended to go to the hospital for ultrasound examination to find out whether the endometrium is abnormally thickened or has abnormal echoes, and gynecological examination to find out whether there is any localized lesion of the cervix; it is recommended to do cervical cancer screening, and according to the results of the examination, symptomatic treatment will be given.