am i pregnant ..

so the last time i had unprotected sex was on the 28th of December , i was suppose to start my period on the 17th of this month . my moms period was a week late , idk if that has to do with anything but usually if she’s late i’m late . i had sex again tonight to see if it would start my period and it didn’t . so i don’t know what to do .. if i’m pregnant i can’t tell my parents , i’m 15 almost 16 and they will literally disown me .