If you want to have your menstrual period but can’t get it off, consider that it is delayed menstruation, which may be due to pregnancy, drug effects, endocrine disorders, mental tension and so on. 1. Pregnancy: After pregnancy, the hormone level in the body will be higher, and the endometrium will no longer shed, so the symptom of not having menstruation will occur. 2. Drugs: If you use some drugs containing progesterone, such as progesterone, emergency contraceptive pills, etc. will lead to luteal phase prolongation, so that menstruation is delayed. 3. Endocrine disorders: obesity, excessive dieting or irregular living can cause endocrine disorders in women, and the hormone levels in the body will be disturbed, resulting in delayed menstruation. 4. Mental tension: mental tension or stress will affect the function of the hypothalamus-pituitary-ovarian axis, which will also affect the normal menstrual flow. There may be other reasons why menstruation does not come when you want it to, so it is recommended that you go to the hospital for a detailed examination after your menstrual period has been delayed, so that you can get the right treatment for the cause of the problem.