Join Date: Apr 2009
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Nope, not positive.. YET. I found that particular brand to be difficult for me. They weren't sensitive (which was good but only so good and then it was bad) but I'd easily miss my already short LH surge even with testing 2-3x per day.
I use cheapies from eBay (50 for $18 shipped) that work AWESOME for me anyway. CBEFM never worked, but only because I surge in the afternoon, so it missed my peak.