Glow says I'm on my 2nd period day, but it never started.

Kristen • -Mommy of a 4 year old & 2 angel babies💜-Expecting my Rainbow in March 2017!
Glo says that I'm on my second period day, but my period didn't start yesterday. How do I fix it so that it doesn't throw off my predictions or anything? I haven't even logged my period.