Positive opk and still doesn't move fertile window?

Lemony • 34,Ttc #1, married 2 yrs. endometriosis. Miscarried 8wks at 1 n1/2 years ago. Now pregnant with my first, 12 weeks
opk detected that I had LH surge both today and yesterday, strong positive lines, I inputted them into my daily log, and still glow didn't change the prediction on my fertile window. It is still set to start a few days later on  April 1st. It is frustrating. However, fertility friend and Ovia seems to be able to be much more flexible in comparison. 

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