Q: I had a progesterone blood level done on CD 21 and it was 0.5 ng/ml. Is that low progesterone level a problem?
A: This low progesterone level usually means that you either haven't ovulated yet or you ovulated and the blood was drawn too early. Progesterone levels usually increase after ovulation, and 7-10 days after ovulation is a perfect time to check the level. A level over 10 ng/ml usually means that you ovulated.