Sexxxx

Okay, ladies . I have a issue; last night me & my so had sex (tmi I know) but I was on top & I came like four times & as he's about to finish I get off & he notices a lot of blood; my period has already came and gone. It was the bright red & slimy blood & still has not stopped. I took a pregnancy test hours before & it was negative. Help? What could it be from... 😏😏😏😏