A lot of blood after sex

My boyfriend and I had very rough sex and after there was sooooo much blood(this has never happened before). I knew we went hard but I never felt any pain during it and I actually orgasmed! But the bleeding continued for 2 hours after and actually started to hurt so much I just took a nap. I’m fine now it’s the next day I was a little sore this morning but now I’m perfectly fine. Does anyone have a reason / similar experience ?