BLEEDING AFTER ANAL 🚫TMI🚫 FOR MATURE PEOPLE

A couple hours ago I had done anal with my bf. He's average sized, but I still couldn't bare the pain. Then a couple minutes ago I thought I got my period after blood poured onto my underwear, so I sat on the toilet and the blood kept coming. Then I wiped my vag and there was no blood. Then I wiped my ass and there was lots of blood, and it hurt really bad! It's still bleeding, please help!