OPK beats mucus: Every time. The OPK are not perfect but they are highly reliable, 'fertile mucus' is very ambiguous. I'd trust the OPK everytime.
Answered 2/13/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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