I had my progesterone tested d21 and my number was 13 I think. He said that I ov'd, but I didn't get pregnant that month:( Good luck to you...Great follicle size.
Typically your progesterone levels should be checked on cd 21 and if you ovulated they should be above 10. Progesterone levels alone are not a sign you are pregnant; they just tell you whether you ovulated. HCG levels tell you whether you are pregnant.
Good luck!
p.s. We went through fertility treatments and my dh was not always able to produce so I know how frustrating this must be. Hang in there!!!
(((HUGS)))
Sorry can't help although I had many IUI's I've always just waited 12 days to take a HPT. Never had blood checked afterwards. Good luck.