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June 28th, 2013, 11:14 AM
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Spyctre Spyctre is offline
Arwen
Join Date: Aug 2009
Location: Freaking Louisiana
Posts: 7,664
I didn't test positive with my first two pregnancies for a long time. Never got a positive with the first, but I had a clear miscarriage at 8 weeks. My second I got my first BFP at 8 weeks.

There's also something called the Hook Effect. I hear it's more common in twin pregnancies. Something about so much HCG that the test can't process it.
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