OPK question!!!!!!

Daina • 25. Married 10/29/17, Pregnant with Baby #1

So i tested twice a day from CD8 to CD 35

I got my positive OPK on CD26 (CD32) at like 3am it stayed positive until sometimes on 27th (CD33) i tested when i got up and when i went to bed. It was negative when i went to bed the 27th

I use the clinical guard opks

The tests says you ovulate after your surge 24-48 hours

So when did i ovulate most likely? 27/28? Which is CD 33 or 34???

I’m so confused trying to figure out how many DPO i am...