MY PERIOD IS LATE HELP

Rylee
It's telling me that my period was supposed to start Monday. I never got it all week. I had sex on Friday and Saturday. We used acondom and I didn't think here was a possibility of me getting pregnant, until my period was late. I still have not had my period. It says it's 10 days late. I don't know if this is normal, or if it means I'm pregnant, or what. I'm 16 and I'm so scared.