Question

So I lost my virginity 2 days ago, we used a condom and all. My period was due yesterday but never showed. I usually get really bad period symptoms, like sore breast, and I feel like sick. My breast just became sore, I logged that my period was late and the app said 3% pregnancy risk. Now I know stress can delay your period but this app just made me nervous and scared at the same time. (I am 19 and a college student and I don't plan on having a kid. Please save rude comments I just need advice or something)