When does "dpo" start??

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I would say cd 16.

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My obvious positive test is cycle day 16- does that mean cycle day 17 is 1 dpo? I'm just confused because I know your LH surge happens anywhere from 12 to 36 hours before ovulation.. Thanks in advance!

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It's hard to know because your LH surge can happen anywhere from 12-36 hours before ovulation. I started charting bbt so I could be certain. Your bbt will rise the day after you O.

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Cd 16 has the darkest positive.

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I would say since your surge was on cd 16 1dpo would be cd 18.

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CD 16 would be positive OPK, CD 17 would be day of ovulation, and CD 18 would be 1dpo.

When does "dpo" start??

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