should I be taking my OPK first thing in the morning or later in the day?

Ariella
opk first thing in the morning or later in the day?" />
Please help, I got a positive opk yesterday morning, and I wanted to check to make sure later on in the day, so I took one again later in the day and got a neg, and I just took one this morning (first urine) and it's negative again....

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