Post sex bleeding

I had sex the day after my period ended and I am not on any forms of Bc. We didn’t use a condom but he didn’t cum from sex( I have him a blowjob 5 min after). It wasn’t nessesarly rough, but it was going kind of deep in me. Now I have some blood In my discharge , does anyone know why? I’m also concerned about possible pregnancy. I know he didn’t cum but precum can get me preg. Just want some opinions about my chances!!! Please help out