It is not necessarily normal for girls to postpone their periods for 5 days, the details are as follows: 1. Normal: most normal cycles for girls are within 28-30 days, it is normal for girls to postpone their periods for 5 days each time, indicating that the follicular phase of girls is 5 days longer than normal for women, i.e. the follicles mature 5 days later. Menstruation is 7 days earlier or later, which means that the menstrual cycle is normal within 23-35 days; 2. Abnormal: If the menstrual cycle is chaotic, such as occasionally early or often pushed back, a girl’s menstrual delay of 5 days is abnormal; every menstrual cycle is in 28-30 days and a sudden delay of 5 days is abnormal. If you have sex, you must exclude accidental pregnancy, which may also be caused by an occasional menstrual disorder.