So confused! :(

I got six positive opk, then went to the doctor to get the "CD21" ovulation test and it showed I didn't ovulate. However, I ended up not going on the actual CD21 because that was the first day i got a pos opk. I went on CD29 once I got a negative opk. So i figured i ovulate later than most and thought i should wait to get the "CD21" test done. Has this happened to anyone else? Positive opk but negative blood work? :(