I Had Sex On Thursday Unprotected, But No Cum Was

I had sex on Thursday unprotected, but no cum was inside me. The next day I took an option 2 pill and I had felt side effects of cramping in my legs however they were gone after a day. Yesterday my bf and I were touching each other standing up and he was fingering me and he noticed blood on his hands. Ever since yesterday I have been bleeding but it doesn't show up on my underwear i only see it when i check up there. What is going on. Did he cut me ?