Why does my period stop and then start again after taking progesterone?

Jan 09, 2023 Source: Cainiu Health
Disease description:

Two days ago, my period stopped after taking progesterone, but today I noticed my period has come again. Why does my period stop after taking progesterone and then start again?

Doctor's answer (1)
Dr. Zhao Xiaodong
After taking progesterone, if menstruation stops and then reoccurs, this may be due to withdrawal bleeding, menstrual onset, or other reasons. When withdrawal bleeding occurs, if progesterone is not taken orally as prescribed by a doctor or if doses are missed, light bleeding may result. It could also be the onset of menstruation; if the amount and color of the bleeding are similar to a normal menstrual flow and the duration matches the usual menstrual period, this indicates that the woman's progesterone levels are relatively high.