OPK getting darker but not a positive 🙁

Kay

For the past few cycles, my opk results showed darkening lines, but never a clear positive where test line should be at least as dark as control line. Has this happened to anyone? I test opk every few hours, so the only time I could have missed the surge would’ve been during the night. I do use bbt, which shows elevated temps after I supposedly ovulated. That’s how I totally missed my fertile window last cycle. 🤦🏻‍♀️

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