From day 1 to 14 of your menstrual cycle, progesterone level should be 1-1. 5 ng/ml. Your ovulation (period when you can get pregnant), should occur between day 12-14; which means that your progesterone level should be around 1. 5-2 ng/ml. if you get pregnant, you progesterone levels will be 9-47 mg/ml during the first trimester of pregnancy.