When do you count your dpo

H.H. • Di/Di twin boys due 12/31/15🎉🎆🎊👶👶💙💙
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Ok, so somebody asked a couple of days ago on one of the forums " what day do you count as dpo 1?". I noticed several responses were "the day after you get a +opk is dpo 1". That being said, glow and my other app counts it as the 2nd day. So what day do you guys count dpo 1? The day following a + opk or day 2 following a +opk

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