Could I be pregnant?!

So, I had sex with this boy about 2 weeks ago and the condom broke and we didn’t realize until he saw his tip was out of it. That same day he went to go get a plan b so I can take it and I did. But recently I’ve been feeling like nauseous and been having really bad stomach aches. It’s could be my period coming but I NEVER feel like this for my period. It says it’s supposed to come this week so I’m gonna wait. But if it doesn’t come by the day it says or the day after, I’m gonna take a pregnancy test. Could I be though?! I could just be scaring myself.