Is this normal??! ((TMI warning))

When my boyfriend and I have sex because I’m on birth control he always finishes inside me. But when it comes out on the bed it always has like alittle tiny of blood in it which is confusing. Sex never hurts and he isn’t crazy big. I am on the implant if that helps but I don’t have spotting unless it’s my period but my period has been over for like two weeks.whats wrong with me??