Will I be fine??

I had sex today and we didn’t use a condom the first round. He was going and then I felt him pull out and he was cumming. I felt some liquid get on my leg but I think that was it. He swore up and down that he did not cum IN me, that nothing got in me and that I have nothing to worry about but ofc I’ll worry. I’ve been on the birth control pill since May...should I take a plan b just in case or will I be good?