my period is late!!

hey, if you don’t know me, my name is destiny and i’m 15 years old, a sophomore in high school. i’m sort of freaking out right now because my period is late and i have no idea why! i’m currently not and never have been, sexually active so that’s definitely not a factor. i’ve never been late on my period ever since i first got it when i was 11 (early bloomer), so even being late 1 day is odd for me. please help! i don’t know what to do and i’m very worried :((:((