bleeding from finger banging??!

so I just got home from being with my fwb and we had car sex and I just went to the bathroom to go pee and I'm bleeding?! I just finished my period so i don't think that's it?! this is not the first time I've had sex so ??? maybe it's from when he was finger banging me really hard???? the blood doesn't really look like my period blood it's like a lighter red?? should I tell him ?!