Overthinking it...

My boyfriend and I had unprotected sex the day after I ovulated according to this app. (A stupid decision, I am well aware.) He pulled out, but went back in again without peeing first, and pulled out again no problem. I'm just hella nervous and so is he. He didn't know that was a problem until it was too late to take a plan b. My period isn't due for a week, but I'm already on edge. Should I be worried, or am I just overthinking it?