had sex for the first time and scared

I had sex for the first time and it was unprotected.. yeah, I know I’m stupid. However, he told me he pulled out, and I saw him pull out and ejaculate on my thigh, before wiping off and going back in-

I’m new to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and hope that I can get some advice here. I’m very paranoid right now, even though I probably shouldn’t be. This was 3 nights ago approximately- would plan b still work?