So I was told in May that my progesterone levels were undetectable through a blood test I had done at my OB's. They told me to take opk's to see if I'm ovulating, the first month I did not get a positive opk. I called them back and they told me to take another one next month. Had some personal issues come up and so I didn't take another opk until this cycle, AF expected 9/15, I got a positive opk on Saturday. I called my doctor and they are going to check my progesterone again through blood draw but not until this Saturday. Does anyone know if that is common, to do the test 1 week from ovulation?