When does the tww begin?

Coffeemom
I finally got a positive opk yesterday and this morning it's still positive. So when will be considered 1dpo?
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COMMENT (3)

An

Posted at
generally count the day after + opk as ovulation day. so 2 days after opk would be 1dpo. might be off by a day because you can ovulate anywhere from 12-48 hours after positive opk 

Co

Coffeemom • Jan 27, 2017
makes sense, thank you!

Jo

Posted at
For me the app claimed that I o'ed on the second day of positive opk so the next day (last green) was 1DPO. Hope that's true...