Progesterone Test

Malia

So confused. My positive OPK was on the 5th so my doctor had me go in yesterday for bloodwork. My progesterone was at 8.71 so the nurse said I was about to ovulate. When I got off of the phone I took two tests and they are negative. The doctor said she wanted to do my test yesterday since it would be 5 days after ovulation. I don’t understand. Has anyone had their progesterone tested on cycle day 21?