Scared

So my boyfriend and i had sex last night, we don’t use condoms but he pulls and and i jerk him off until he cums. well it was dark and the cum got on my vagina, we don’t know if any fell inside but it was on it. i’m on birth control (i have been for almost a year) but i never take it at the same time anymore bc of work. it’s usually take around 10pm tho. should i get plan b or do you think i’ll be ok?