period sex?

So yesterday my boyfriend and I were having sex and I started bleeding write in the middle of it. I thought it was a disaster bc he had blood on him too. He told me everything was okay and no one plans it to happen sometimes. 
After I put my tampon in, it was time for me to go home. But this morning I wake up and take it out but nothing is on my tampon. I'm wondering if he just tore me and that's what caused bleeding...?? 
My v hurts a little from what it was last night after we had sex and I put my tampon in.
I need to know so if I am on my period for sure, I can schedule an appointment for my birth control implant. 
Any thoughts?