Best time of day to use an OPK?

Marissa • Mom to Hezekiah 10/23/17 (🌈) & Noah 2/8/20 (🌈) Baby #3 due 3/27/22
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I've seen that some ladies test using FMU & some do in the evenings. Does it matter/affect the test results? I'm starting to use them next week for the first time so I want to do what others have had success doing! 

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