Glow...how to fix incorrect period dates

Myra
So. Glow is not letting me delete period days it scheduled on its own. my last period happened like 12 days after my regular period. so now that I'm supposed to be on my period and I'm not, GLOW is recording that I am. I've tried to delete the days recorded but it keeps stating that I can't delete my recent period which never came in the first place. ... how do I fix it if it doesn't give me an option that there is no period????