When is it 1dpo

So i had a positive opk the day before yesterday in the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>, then yesterday morning it was at it's peak very strong opk, come yesterday <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> i had bloating and pains and today cramps and bloating and a faint negative opk. So is todau ovulation day and tomorrow 1dpo or today 1dpo considering you ovulate 12/24 hours after a positive opk......????so confusing