pregnant from a blowjob?

It was both our first times and I bled when he fingered me, but I didn’t come. After, I gave him a blowjob but tried to stay away from the head most of the time because of a rumor about “pre-cum” I heard. I don’t want to sound dumb but I need to be sure I can’t get pregnant from a blowjob lmao. should i start taking birth control though? i know there’s gonna be another session and i want to be sure