What does it mean if glow says n time says I should be ovulating but ..

Laura • After many long years I`ve found the love of my life n I`d love to give him a family❤️
Glow says I'm in my fertile window, yet over the last 5 days I've taken 2 ovulation tests and both tests did not come up positive for me to be ovulating... I don't know how I woulda ovulated RIGHT after my period.. My next AF is due on the 17th...any suggestions on what this could mean? 

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