Help when did I ovulate. If I ovulated on the 6th I’m 18 DPO and still BFN

Monika • Mom of 3. adopted boy and girl, rainbow baby girl after TTC for 21 years
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I used opk and got my peak on the 5th and My bbt has been going up. But I would be 4 days late on my period and still getting BFN. I didn’t use ovulation tests but my bbt dropped and then shot back up and started up again if this was you would you use the 6th or 16th as your ovulation day?

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