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same sample different results. opk test!

The "Answer" opk showed my lh surge positive since cd 15 until today which is cd18. I was confused as I thought I ovulated on cd15 mostly.

Today -cd 18 I took two strips for the same sample (fmu)

1. "Answer" opk (dark line)

2. Clear blue opk (very faint line)

What do I make out of this?

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same sample different results. opk test!

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