advice please!

So me and my bf were doing it raw and he didn’t get to finish bc we had company show up. long story short he didn’t finish but had some precum. i’ve read different things about a possibility of getting pregnant from precum. i should get my period in a week but i don’t think i need a plan b. i don’t think it’s necessary but im not 100% sure. if this has happened to anyone please lmk what you did or any info would help me! We also don’t have unprotected sex often. this was just in the moment