feel silly asking this

Elizabeth
So I feel silly asking this but I've seen sillier questions here so here it goes. I'm a day away from ovulation and today my boyfriend accidentally finished right ontop of my vagina. I'm not really sure if any got inside but is there a way some could have gotten inside and potentially get me pregnant. We're not trying to get pregnant or anything but we agreed not to take any plan b. 
Should I be a little worried?