Used to ovulate- no (+) OPK since Letrozole

As

I used to get positive OPKs. Since starting letrozole 3 cycles ago, I now get darker lines around CD 13-15 before the line goes away, but it’s never darker than the test line/ positive.

Any ideas what’s going on? I’m testing 2x/day and have a shorter cycle (24-25 days). Used to ovulate around day 16

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