Late Period

Hello, my name is Yuri I'm 15 and I just wanted to clarify something. 😅 Two months ago on the last day of my period (June 17th) and had sex (protected sex) but it was quick and neither of us hit climax (had an orgasm) even though I wasn't really ready to have sex and days passed but I feared I was pregnant but in the end, had my period July 14th but the problem is I still fear I'm pregnant due to not having my period and it has been six days after the day it was suppose to be on ( August 17th). Not only I'm just anxious and just wanted to know that is there a possibility that I am pregnant or that is just a normal thing to miss your period?