Frustrated, question for Clomid CD 3-7

Lillo
So I am on my second round of Clomid. This time I did 3-7. Last time I did 5-9 and got a positive OPK on CD 13. I'm currently on CD 13, and nothing close to a positive yet. This is  a pic of today. I will start testing twice a day now. I'm concerned I either missed my surge or won't ovulate this cycle, and am discouraged. 
When did anyone else ovulate when taking Clomid on days 3-7?