pregnancy scare

okay. so I'm freaking out. I'm not on the pill. I'm 17. I had sex but with a condom. a couple days ago, my stomach started to hurt a little bit & my breasts were a bit sore. the next day, I went to my boyfriends house & he mentioned something about me getting pregnant & how he was scared. ever since then, I've been in situations that involved someone being pregnant. comments about my brother getting a girl pregnant. stuff like that and now I'm stressing. should I be stressed or do I have nothing to worry about?