Im just paranoid but I need opinions

I had sex with my boyfriend today and I am on birth control taking it consistently unless I miss by an hour or two. I was on top and we felt something like he came but he explained that he didn’t get the sensation of orgasming and I don’t know if he came inside of me if he did. Also we noticed it was barely any as well. I need opinions as to if I should just pay for plan b to stop being stressed or if im actually okay.