HELP ASAP

So a guy and I just decided to fuck for the first time. He popped my cherry + I was on my period. We were at his friends house drunk af and when we were done I brought a flash light to the room. There is blood everywhere on his shirt, covering the mattress, the pillow. I flipped the mattress but u can tell it's been flipped, I have hi shirt and idk what to do with it, and over all I'm embarrassed. What do I do?!