I‘m not familiar with FF and since we measure in Celsius I‘m not sure how much the dip in your chart actually is, but I would also guess you Oed on CD 15 or even 16, because since then your temp rose, Right?
The dip a few days later could be an estrogen dip (I hope this is right translated), which often happens 6-8 days after O but doesn’t predict anything about being pregnant or not. I had it when not being pregnant and while being pregnant as well..
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