When is the O?!

Lisa L. • Hoping and praying to give my sweet girls one more sibling.
Hi, I've noticed my fertile window will move around depending when I get an opk+. That day is usually my highest percentage and I have two more fertile "green" days after. Does anyone know what day Glow is considering as your O day? The day of the +? The day after? Or the second day after??

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