Is a little blood after sex normal?

I’ve been running on a dry spell for over two years now and just had sex with my friend this afternoon. He has the biggest penis out of my entire experience so it felt a bit tight when we had sex. When I went to the bathroom to pee I notice a little bit of blood coming out, I just got off my period this past Thursday so I know it can’t be that. Would this be normal for me since I haven’t had sex in a long time and never had a penis inside of me that was bigger than his?