During Sex

So me and my boyfriend had sex last night multiple times bt after the 1st time when i turned on the lights i notice there was blood on the bed . He always does this to me. Hes about 6" which is perfect for me. He does go pretty deep bt not in sence that is wayyyy too rough for me. My period ended last week on wednesday. So he'll either make my period start depending where we are in my cycle or ill bleed on the 1st round. My period in never on schedule. Only thing i can really think of that may have made me bleed was when i was on top and it hurt on a certain spot i just couldnt take it. Bt thats just this time. Does this happen to anyone else?