Could glow be wrong?

Hanna • I'm 21 and have an almost 3 year old daughter. Engaged to the most amazing man. Hoping to have a baby together real soon! (:
Glow is usually on time with my periods but Feb I started on the 22nd right when glow said then I started on the 20th in March right on time with glow this month glow says I should start today. I've been cramping for 3 days which is so weird for me and really exhausted can't stay awake for the whole day. Period hasn't shown up but I feel like the 14th is early and that glow is wrong. Maybe ovulated early. I don't know when to test.

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