OPK test feedback

Becca

I'm concerned i may not be ovulating. Today is the last day of my fertile window. Glo says I ovulated on the 15th. The LH test stRip instruction booklet says a positive "matches or is similar to the test line".

This is Mo 16 of TTC. This is the first time I have tested this long: usually the darker progression lines are two days, max, then fade immediately on the following days!

Anyone have a similar experience or feedback?