opk confusion

Kaylie • 🌈 👶coming April 2019

Hi, usually ovulate cycle day 15 but have been testing with cheapies that always work but I'm cycle day 17 and no positive yet. This afternoon I did a first response advance one and it was peak, then did a first response normal and it was negative. How is this possible??!! Could it be a false positive on the opk advance one?

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