Bleeding after intercourse is mainly considered to be hymenal rupture, but it cannot be ruled out that it is menstruation, and a small amount of bleeding can occur again after intercourse just after menstruation. The first time you have intercourse is the first time most women have intercourse. The first time you have intercourse, the hymen will rupture and cause a small amount of bleeding, and the woman will feel pain and bleed less. If the cavernous intercourse happens to be close to menstruation, the cavernous intercourse will stimulate early menstruation and bleeding will be followed by menstruation. If you have intercourse just after your period, the accumulated blood in the uterus has not been completely drained, and the uterus is stimulated and vibrates strongly, bleeding will occur. These are normal physiological phenomena. If there is no special discomfort, you can just continue to observe.