am I going to get pregnant???

My boyfriend and I have had unprotected sex a few times but last night, he came on my hip area and it ran down allllllll over the outside of my vagina and all the way down to my butt and we’ve both been semi paranoid we’re going to get pregnant so I took a plan b right after all of this went down, but was it even necessary? We’re we just overreacting?

Also I’ve heard different theories on pre-cum, is it possible to get pregnant from it?

I know I’m over stressing but I’m also curious.

Thank you.