This is Dr. David
after sex, you can have lacerations or tears of your vaginal canal or trauma to your cervix which can cause you to bleed
bleeding for 5 days is pretty serious
I hope you have stopped bleeding
you should see a gyn doctor and get a gyn examination to see if you had tears or lacerations or trauma from the sex which caused bleeding and to make sure you are healing properly
have you had a gyn exam before?