Am I pregnant or just freaking out

Okay, I need advice. I'm 15 and had sex for the first time about 5 week ago with my boyfriend that I've been with for almost 2 years. My belly hurts often and I guess just having a thought that we didn't use a condom I could be pregnant. and I'm just terrified of the thought that there's a chance I could be pregnant. am I just freaking out for no reason?