Right I know that but my question is why am I getting positives like I am on different CD? I'm counting CD 10 as my dpo at the moment but still getting positives.
You might be able to find a FAQ page on their website, or an 800 number. I believe the OPK test kits are designed to identify your hormone surge (check this, I think it is the lutenizing hormone) and that the hormone surge is what brings on the ovulation. Seems the last time I read about how OPKs work, the surge starts and then ovulation is expected to happen in a day or two from when the surge is first detected. This should all be in the literature with the OPK and also on their website, though. It's been a long time since I read it.