Missing period?

I’m 15 and have had my period for 2 years. It is likely that I could have missed it due to stress/it just being irregular. Or should I be worried that something is wrong. I am not sexually active (p in v sex) but I have fooled around with my bf (so I’m assuming there’s no chance I could be pregnant). I don’t know why but I was extremely stressed that I was pregnant (even though I am educated enough to know that I can’t possibly be) so maybe that has impacted my menstrual cycle? Anyone have advice?