late period

hello i’m 15 and my boyfriend and i haven’t had sex. We do stuff but we’ve never had actual sex. Now my period is late by 5 days (according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>) and i’m worried. I got my first period in may of last year and it was irregular/didn’t happen again until last month, i assumed that was the first month of my regular cycle but now i’m 5 days late. How worried should i be?? i’m spotting and i’ve had cramps for about two days