So I got my first positive on CD13 at 12pm and later got negative as in the green square. I'm pretty sure i ovulated the next day as I had terrible cramps, bloat and nauseous on the day of positive opk.

Then the next day I happened to get two more days of positive opk before I started to get my negative back.

This never happens to me. Do you have any idea why this happened? Does the first negative was just diluted urine and I have three days of positive? I didnt chart my temp.