Usually only a true positive you are likely to get two days in a row because the OPK is showing a LH surge which happens approx 24-48 hours prior to O. Sometimes the second line is not as strong. I usually see when the line is the strongest and generally consider that to be the day before O.
Just keep bding- some months ive had only one day being + and others 2 to 3 of the same strength and others varying from pale leading up to the strong dark line.
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