Poop coming out of the vagina.

Okay, so I'm really scared. My boyfriend and I tried anal for the first time the past friday. Today I went to pee and I noticed poop coming out of my vagina! I need help! At first I thought that it was because of the way I cleaned myself but then I kept on cleaning my vagina to make sure and It was really poop from out of my vagina. It's the first time this happens to me, I looked for it in the internet and it said it could be a fistula but nothing about a fistula related with anal sex. HEEELP