should I take a plan b pill??

Hey everyone hope all of you are having a great day. Me and my boyfriend had sex this morning and we had sex with a condom and then went for round two. We didn't use a condom the second time and he pulled out before he came. But I'm worried that I could get pregnant because I'm in the middle of my fertile window and I read that sperm can be left over in the urethra from him ejaculating before and get released with pre cum. So I just want to see what you guys think and if I should not worry about it and hurt wait for my period in 2 weeks? I'm just freaked out about itamd could really use some insight thanks!☺️