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BBT vs OPK

Brianna • Tue, Mar 09

Progesterone confirmed I ovulated, but not sure when. Temp looks like I ovulated CD 17, but my OPK wasn’t positive until several days later. I also had an US CD 15 and largest follicle was only 4mm, so I have a hard time believing I ovulated 2 days later. Thoughts? I did do clomid this cycle.