Positive opk?

Top on is cd 7, middle two are cd 8 morning and afternoon, and bottom is cd 9 morning. Then they started getting lighter again after that. I didn't think it was positive because I don't normally get my positive til cd 11 or 12 and it didn't look quite dark enough to me. So now I'm confused! Anyone have any ideas? These are just cheap target brand ones too. 

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