The main reason why your period is particularly heavy after taking progesterone is that progesterone is a progestin, which causes abnormal thickening of the uterine lining after taking it. The reason for menstruation is the shedding of the endometrium, which is what causes the bleeding. The shedding of the thickened endometrium will lead to an increase in bleeding, so the amount of menstruation will also increase. This is the increase in menstruation caused by taking progesterone, so there is no need to be nervous. Next month without progesterone, then observe whether your menstrual flow still increases. If it has returned to its normal state, there is no need to deal with it clinically. If your menstrual flow still increases without progesterone, it is recommended to have a blood test for sex hormone six to see if the heavy menstrual flow is caused by endocrine disorder.