Pregnancy scare..

I need someone to talk to who knows about all this pregnancy stuff. So me and my boyfriend have been having unprotected sex (dumb I know). The first time we had sex was the 4th of July and then we had sex the 9th of July and according to this app I was suppose to get my period today but I didn’t.. Could it be because I had sex??? I’m not on birth control and I didnt take a plan B. And also he didn’t cum inside of me at all, could I be pregnant?? I’m so scared.