Why does traveling to Hainan delay menstruation?

Opinions and Suggestions:

Progesterone can be used. The common method is oral medroxyprogesterone, 1-2 days before menstruation is about to come (menstruation has already come, even if it is just a little) Not suitable), take it 2-3 times a day, 3-2 tablets each time, just take it continuously. Menstruation will not occur during the period of taking it. Determine the number of days to take the drug based on the characteristic that menstruation occurs 3 days after stopping taking the drug. Short-term use of progesterone will not cause harm to the user and has no major side effects.