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OPK help please

Francesca • Tue, Aug 13

So I’m currently CD8 and have been using opks since CD6 and I’ve been using the clear blue advance monitor and cheap ones from amazon to compare. Yesterday and today my monitor has said high but the cheap ones have not shown a 2nd line at all. The control line shows so I’m thinking they can’t be a faulty batch but surely the 2 methods can’t be that far out? Just wondering everyones opinions please. Both photos from today