Progesterone is a progestogen that not only promotes the growth of the uterine lining, but also plays a role in preserving the fetus. As for the number of days of oral intake, the maximum number of days you can take may vary depending on your needs. For example, if you use progesterone to promote menstruation, you can take it orally from the middle of your period and stop taking it for 10 days at most, and normal menstruation will resume 5-7 days after you stop taking it. Since progesterone can cause a continuous growth of the lining, it is important to observe the menstrual period as it may be accompanied by heavy bleeding. For example, there is no time limit for oral progesterone to be used for the treatment of fetal retention, and it should be discontinued gradually according to the recovery of progesterone, including HCG. Avoid blindly stopping the medication on your own can cause a miscarriage or even a pre-eclampsia, so be sure to stop the medication as prescribed by your doctor.