Progesterone CD 21 result

Shravana • Blessed with baby girl 11/1/17 😊
Hi ladies,
So my day 21 blood work came out to be 4.04 after being on Clomid 100 mg for the first time.  I had a positive opk on day 20 of my cycle where the test line was much darker than the control. I have also had faint lines before and after that. My doc is in question because she would want a 5 and I got 4.04. 
What do u all think ? Any inputs ?