Period late or pregnant?? Help please!

Hi! So I has sex for the first time Sunday night. He wore a condom and pulled out. I was a little worried about pregnancy risk but talked to my sisters, they said it’s normal to worry just because it was my first time. However; I’m supposed to be starting my period any day now, today I was supposed to start. Even if I was pregnant, would my period already stop? Just a little worried and confused. Maybe just stressing about it is making it late, but any ideas would be greatly appreciated!! 💕