When is ovolution after EEMA HMG 75 mg.

I have PCOD. I am trying to conceive from past one year. Consulting a doctor from past few months. Since natural follical growth is not happening. She is giving me letrozol. This is the third cycle that I took letrozol. First cycle follical growth didn't happened. 2nd cycle follical grew well, I had follical scan from 10th day and egg ruptured on 14th day. we had relationship also on suggested date by doctor but still pregnancy didn't happened. Now again on third cycle on 9th day which was yesterday follical scan didn't showed any dominant follical so doctor gave me EEMA HMG 75mg injection. Now she has asked me to come on 17 Dec Friday for scan. She is on leave from today. What is the expected date of ovolution now and shall we have relationship from now untill 17 Dec. I am confused what is expected on the 17 Dec scan.