Blood during sex?

So my boyfriend and I had sex the other day and there was a lot more friction than usual (I wasn’t as wet as usual when we started). I had no issues other than some irritation from the friction. Today we had sex and there was no friction, I could still feel a little of the irritation before we started but no friction during the sex this time. No issues during. He came in me (no condom, I’m on the pill, this is just how we have sex) and when he pulled out after there was a small amount of blood mixed with his come when it came out of me. I’m assuming this blood is mine, but why? I feel fine and no different than usual but I can feel some of that irritation from the friction from the other day still. I went to the washroom after and there was a tiny bit of blood that came out. I’m not due for my period

Any thoughts?