He pulled out but a little part of the cum spread on my vulva. How likely am I to get pregnant from that? 😓

EDIT: I know pull out is not effective, please do not lecture me. We do use condoms but that day I was very irritated so we took it off. Just asking a question so instead of answering you’re focusing on the wrong part. I know it’s possible to get pregnant with pulling out but I’m asking how likely it is with cum that was on my vulva