Generally speaking, most women’s first menstruation is between the ages of 12 and 15, and it is normal for a woman of 13 not to have her period, so don’t worry too much. Menstruation sooner or later by the physical condition of mental stress and other factors, usually pay attention to appropriate exercise, enhance physical fitness, pay attention to nutrition, nutritional balance, eat more vegetables, fruits, but also to eat more eggs, lean meat and other foods rich in high protein, do not excessive dieting to lose weight. In addition, we should pay attention to the combination of work and rest, avoid a long time to stay up late, relax the mind, do not have too much ideological pressure, go to the gynecology department of the regular hospital to do an ultrasound, check the development of the uterine lining and the uterus.