SOS: Pre cum

So i know i necessarily shouldn’t be look at the Internet for help on this... but i just don’t have a mother. My boyfriend and i had sex but before while we were getting a little heated and spiced up - he already came (pre cum), but then we continued to have protected sex after. I don’t believe anything pre cum was inside of me... but how cautious should i be - the condom worked perfectly I’m just freaking out over the before math. (I get my period in a few days too) so also how do i not stress over something like that while my period is approaching?