I'm scared.

So like I said before, me and my boyfriend had sex and I was scared he didn't pull out all the way, and I've been doing research and it's talking about he doesn't know when he "pre-cums" so what if he got some in me. That can get me pregnant. But, the second. Almost third day after we had unprotected sex, I took a pill - take action - cheaper version of plan b. And I'm so scared. My nipples are sore, so I looked to see if it was a side effect but all it pulled up was pregnancy symptoms or pms symptoms. I have a few days til I start my period but I'm still so scared. I definitely won't be having sex unprotected again until I'm ready to have kids. My stomach has been hurting and other stuff but that might just be paranoia. I don't know.