You will have your menstruation on the 17th of last month, and with a normal menstrual cycle, you will have your menstruation around the 15th to 17th of next month. Menstruation is an important stage in a woman’s growth and development, during which the lining of the uterus will shed periodically, usually in cycles of 21-35 days, with an average of 28 days. The cycle usually lasts for 21 to 35 days, with an average of 28 days. The menstrual cycle may vary depending on the individual’s body type and condition. A woman’s menstrual cycle is usually influenced by her recent living conditions, stress and dietary habits, and changes in these factors may cause the onset of menstruation to occur earlier or later, usually within a week. Therefore, when a woman’s menstrual cycle lasts 28-30 days, her next menstrual period will come on the 15th to 17th. If it is too early or too late, it may indicate the presence of endocrine disorders or pregnancy, so it is recommended to go to the hospital in time to have blood tests for the six hormone tests and the early pregnancy test, and to make a detailed judgment based on the test results and the doctor’s recommendations.