If a woman has vaginal bleeding after intercourse a few days after menstruation, it may be caused by the following factors: 1. If the vaginal bleeding occurs after intercourse during ovulation, it may be a normal phenomenon, because some women may have a small amount of bleeding caused by the shedding of the endometrium during ovulation due to the action of estrogen, but the amount of bleeding will be relatively small and the bleeding will disappear in about a day. 2. If the symptoms of bleeding after intercourse occur during non-ovulatory period, it may be caused by cervical disease. This is due to contact bleeding of the cervix under the stimulation of the penis, which is a common clinical condition, such as cervical polyps. 3. If the bleeding is relatively small, it may also be caused by vaginal damage during intercourse, and the bleeding may be caused by ruptured blood vessels, and the bleeding will disappear in 3-4 hours.