bleeding?!

LeAnna • kms
I recently has sex with my SO . (Ive had sex with him a million times) When we first started it hurt, and i didnt know why. After i got past it, it was fine. Then when we were finished, i went to the bathroom and i was bleeding?! Does anyone know why?! Or any advice about it? In really worried, and im far to nervous to ask my mother about it