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First + OPK but Glow doesn't recognise it

Very excited - just got my first positive opk in 3 months!!

I have updated Glow but it still doesn't even think I'm into fertile window!!

I'm on CD13 and think I O last month on CD16 or 17 due to bbt only

Please help.... Anyone else had this?

Thanks :-)

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First + OPK but Glow doesn't recognise it

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