First time using OPK... confused

Jess

Hi everyone, I am supposed to ovulate tomorrow according to Glow, so I began testing 11 days past menstruation based on my cycle. The second day of opk looked like it was getting close to the control color so I dont get why it's been so faint ever since if I'm supposed to ovulate tomorrow. Was that second day line my surge? Wouldnt it show up longer and darker? Thanks for any help.

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