February 7th, 2012, 06:43 AM
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Aidan's Mommy
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Join Date: Apr 2006
Location: Middle of nowhere, ON, Canada
Posts: 17,853
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If you're really anxious about it, I'd say start testing around CD27 or 28. If you can wait, then CD30 or 32 should be definitive (assuming you actually did O when you're thinking you did).
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