Clomid? Ovulation?

Angela
This is my first round of clomid. I took clomid on CD3-7 following my provera induced period. I am currently on CD 9 and my left ovary has been throbbing all evening. I am supposed to start opk on CD11. Could this be because of the clomid? Is it possible for me to be ovulating this early? Anyone else have this symptom?