It depends: They can be very accurate, but - the more irregular your cycles, the less accurate they become. I can't make guarantees online, but i expect if you got a clear + each cycle, and if it was only one + in the cycle then the tests are probably correct. Cd 12 then cd 16 could be correct, but i'd expect the first cycle was shorter than the second?
Answered 11/14/2013
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