Bleeding while having sex 😬


So me and my boyfriend decided to have a little sleep over as we hadn't seen each other in a while. My period had finished over a week ago and for some reason after we had sex there was blood everywhere??!! He thought I was in my period but I explained I already had it, so I started researching this online and all it wanted to tell me is that we had an STI when we've both only been with each other so we was like that's not it then I researched about the pill and if that had anything to do with it. I have no clue what's going on!!! Does anyone else know ??? 😬😬