Iui question

Samantha
Hi there! 
I had my second <a href="https://glowing.com/glow-fertility-program">iui</a> this past sat and sun (10/3 and 10/4) and I had a progesterone check at my RE's office today and the nurse just called and said my progesterone is low (7.5) and now I have to do another Ovidrel shot tonight has this happened to anyone else before?