HELP ME PLEASE

My name is Nikole and I’m 14 years old going to grade 10. So me and my guy best friend had sex, it was a while ago but it still happened, we used a condom and everything was fine. Now my period starts in a few days and I’m worried I might be pregnant, I know this might sound crazy, I mean we used a condom and everything but I still have that worried feeling. Please help.