Should i take a plan b

My boyfriend nutted twice and the second time he pulled out he nutted right on my vagina then rubbed it around As he put it back in.

he’s saying i should be good and that’s he’ll be happy if I’m pregnant anyway because he didn’t want to pull out.

Should i try taking a plan b ? Today is my most high fertile day according to 2 apps so i don’t know if it’ll be to late for a plan b since they don’t work if you’re already ovulating.

I usually check before i have sex but forgot..