Embarrassing sex moment HELP!!!!!

I had sex with this guy I've been seeing for a minute, and he's well huge 😳😊😊. He was being rough but gentle. 

But at the end of it he set back (he was on top) and there was blood on the sheets. No it wasn't my period I don't have that for like two more weeks and my vagina was in so much pain but it felt good during the sex. After I felt like I was dieing. Bt I kinda freaked out and ran to the bathroom. I'm 20 he's 22 and he's only my second sex partner so it was embarrassing and awkward. I quickly left after that and didn't say hardly anything. he was being nice about it and even text me to make sure I was ok but I didnt reply. Was that a mistake? And WHY THE HELL DID I BLEED WHEN HE WASNT BEING THAT ROUGH????