Glow calculations off for my next period?

Question

I just took a pregnancy test yesterday and today the were both BFN. I only did it because glow said today I could. Then when I looked it has my next period starting 4 days early than it should. Has this happened to anyone else?

Answer

Did you put in positive opks earlier? Did you ovulate sooner this month as well according to glow if your not doing opks or bbt?

Glow calculations off for my next period?

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