There are 3 possibilities for taking progesterone and not getting a period for 10 days: 1. There is a possibility that an unwanted pregnancy has occurred. If you have sexual intercourse after taking progesterone, there is still a possibility of pregnancy. 2. If you have conceived while taking progesterone, you may not get your period. 3. 4. It is possible that the dose of progesterone is not enough to promote menstruation, it is recommended to take progesterone capsules orally for 5 days, 200mg a day to achieve the dose to promote menstruation.