OPK questions

Mallory
Those of you on a 28 day cycle what day do you usually get a positive result? I'm on CD 13 and according to my tracking I should be ovulating however I started testing on day 11 got no line and then twice on day 12 (darker line first thing in the morning, faded in afternoon) and once today (little darker than yesterday afternoon) but all very faint lines.

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