Condom slip up

Okay during backshots (sorry for terminology ) the condom slipped off, it came fully off and he completed stopped. But it was like half way out of me and half way in me. He pulled it out quickly since it wasn't really deep inside me. And I even felt cum slip from the condom onto my arm that's how I knew to turn around and ask wtf happened lol. I'm two days late, I'm not really stressing but my main concern is could I get pregnant from that? I've been super grumpy and my breast are super sore so like regular period symptoms . And this happened 9 days before my period. Just need an idea of if I should be stressing or I should just wait for it to come ? Thank you!