PLEASE HELP!!

so i started my period last saturday which means i have been on my period for 5 days. i should be stopping soon but last night i was with my boyfriend and we were just hanging as usual. we started kissing and stuff and i then proceeded to give him head, in the middle of me doing that he asked me if he could “tease” me. i started to freak out a little because 1. i’m on my period and 2. he didn’t have a condom or anything so that would basically be his penis touching my vagina unprotected. after arguing about it back in fourth we agreed of him just teasing me on the outside of my underwear. he did that for a few mins then he moved them to the side and started to play with my vagina and what not while trying to stick it in. he went in pretty deep but i soon told him to stop because my anxiety got the best of me. after that i then finished everything by giving him head and he ejaculated so he was finished. Now here is my question.. is there any possible way i could be pregnant. it is currently the next day and i haven’t felt any symptoms except an upset stomach and nausea, but that could be do to my period or my stress. i’m just freaked out cause i didn’t know if he precumed while he was inside of me even tho i’m pretty sure he didn’t , my ovulation day doesn’t usually start for another like 3 days but idk i’m just freaking out.. Please help me !!!