Pregnant or tummy ache

So last week, my boyfriend and I were making out in my basement. It was pretty steamy too. We're kinda new to our relationship and I told him and that any sex related things are gonna wait for a very long time. While we were making out, his penis was obviously hard. He was wearing compression shorts and athletic shorts and I was wearing undies and athletic as well. I honestly don't think that I could be pregnant because of this. I have also been eating very healthy food lately and a couple days ago, I had really crappy pizza. So I hope it's just the crappy pizza that's making my tummy feel all gross and such. Should I take peptobismol or a pregnancy test?