Is it possible to have two low fertility days and the next day have a peak day?

Question

I’m so confused right now. My glow app say s my fertile days start July 31. I been testing every since with clear blue advance and have been getting low fertile days. The circle sign. So today I test using fmu and it’s the peak sign. What happen to me getting high fertility days with the flashing face? Is it possible to go from low fertility to peak within a day

Answer

Yes it’s possible. Glow is just an estimate and even if you’ve logged enough to make it accurate you can ovulate on different cycle days. The high peak reading on clear blue has nothing to do with LH it measures the estrogen surge that comes before the LH surge. The estrogen surge doesn’t always happen before though it can happen at the same time as the LH surge in which case the Clearblue with override the high reading and go straight to peak because the LH is what’s important. 
And You can tell it’s accurate because the regular OPK is positive. Log it and get to baby dancing. Have sex today tomorrow and the next day.

Is it possible to have two low fertility days and the next day have a peak day?

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