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Progesterone is one of these key hormones of pregnancy. After ovulation progesterone production is triggered by Luteinizing Hormone (LH) which stimulates the corpus luteum (the remnant egg sac) in the ovary to produce progesterone. One of the main actions of progesterone with fertility is to help support a developing embryo.
you should see your gyn doctor right away and have your progesterone levels checked if you are pregnant. you need blood bHCG levels checked as well to confirm your pregnancy
if you are indeed pregnant, you doctors will need to check your progesterone levels to make sure they are increasing like they should
if not, you may need progesterone supplements
so you need to see your gyn doctor before 3 weeks.