What happen if after sex about an hour they have

Patient: What happen if after sex about an hour they have menstruation?? Thank you

Doctor: Thank you for writing to us.If the menstruation is at the regular time, then it is nothing to worry about. If the me nstruation was not supposed to be at this time, then you may have some injury. Please see a Doctor if the bleeding does not stop in 2 days.Hope this helps