Progesterone Clomid and spotting, help!

Just received my progesterone results: 8.01...boo:( however, after researching the web it seems that my doc should have ordered it for CD 21 but instead had me go CD 25! Could it have been higher only three days before? Does time of day taken effect results? This is my first month of Clomid days 3-7 50 mg. also have been spotting brown  since CD 22! Any input is very appreciated :)