Help me please!!

If I usually have a cycle that is 28-30 days somewhere in there is it likely I'll ovulate during my period...? I had dry sex and precum may have touched my outer vagina when I fixed my pants. I was on day 3 of my period(yesterday) I took plan b to try and ease my mind this afternoon but I'm still paranoid😭 what's the chance of me becoming pregnant still..? I'm freaking out