Plan B or chance it...

My boyfriend and I showered together for the first time today and he got precum on my stomach because of how much taller he is compared to me. While we were in there we got a little handsy and he was fingering me. Should I be worried about the precum potentially having gone down near my vagina and him having it on his finger when he went inside me? Or should I not be worried about it and take a chance? I am about 2 weeks away from my period, and neither of us got off while we were in the shower. Any help would be appreciated!