Question about charting!

katey
This is my first time temping. My cp and cm indicate that I may be in my fertile period and may be getting ready to ovulate. My temp dipped yesterday and rose today. From what I understand, I need two more days of higher temps to confirm ovulation. My question is, when should I expect to see a positive opk? If everything else is indicating ovulation, shouldn't I have a positive opk. I have attached a picture of this morning's test.