When do you think ovulation occurred?
I took a random OPK, it was positive, on Aug. 2, however I don't know when my first was, as I didn't have any strips prior, and I usually have about 2.5-3 days of a surge. Anyway, without the OPK, FF has my O day as CD20, with it, it makes as CD 21. I know it's not a huge difference, but based on my chart. Which CD do you agree with? I think it's CD 21. Thoughts?

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