Blood work and no ovulation

Went in for my 22 day blood work yesterday and progesterone shows no ovulation. I did have a positive opk and ewcm on CD15 but they are concerned it was a false positive. They having me take 150mg of clomid starting tomorrow so we will immediately go to CD5 and I will skip having a period this month. I'll go I next Wednesday for an ultra sound to check to see how I am responding.