What is the reason for not having a menstrual period after taking progesterone?

Patient's question:

Duration of onset and persistence: 48 days
Current general condition: Irritable, no pain symptoms.
Medical history: No previous diagnosis or treatment history.
Pregnancy status: Not pregnant.

Doctor's answer:

Hello, when there are no special circumstances, menstruation does not cause inconvenient effects on a woman's life. However, when an athlete is about to compete, planning a trip, or preparing for major exams, if menstruation occurs, it can indeed be embarrassing, troublesome, and inconvenient, and this impact can even lead to lasting regret.
In fact, controlling the timing of menstruation is a relatively simple matter. People can make appropriate adjustments, and such adjustments generally do not have adverse effects on mature women—only the menstrual cycle is "rearranged."
Progestin drugs like Medroxyprogesterone (also known as Progestin) can delay the shedding of the endometrium, thereby postponing the onset of menstruation. A few days after stopping the medication, the endometrium, deprived of progestin support, sheds, and menstruation occurs. This drug is easy to take, with side effects limited to occasional nausea, vomiting, or headaches, and it does not cause endocrine disorders. Short-term or occasional use will not lead to weight gain or other health issues.
It is worth noting that artificially regulating the timing of menstruation generally does not cause problems for future normal menstrual cycles or lead to ovulation dysfunction resulting in infertility. Of course, medication should not be used to adjust the menstrual cycle unless there are special circumstances, as these methods are only for emergency use and should not be overused in daily life to avoid interference from external hormones disrupting a woman's normal menstrual cycle. It is particularly important to do so under the guidance of a gynecologist.