please help

So I'm a virgn but the other day my boyfriend and I got pretty frisky and he started to ya know, put it in, and I stopped him because he wasn't wearing a condom and then just shut everything down. He handeled it really well, but now I'm concerned I may be pregnant. My period is late according to eve, but I've never really been regular and I'm noticing a lot of symptoms that can be attributed to both pre period and pregnancy and I don't know what to think. Am I freaking out too much? I'm old enough to know how to deal with this but also I don't know what to do. Please help and if you need clarification on anything let me know.