It is not normal for a girl to have her first period in a few days. It is recommended to go to the regular hospital for further examination, and after clarifying the cause of the disease, treat the cause of the disease. A girl’s period usually comes once a month, with a cycle of 28 to 30 days, usually 7 days earlier or later, which is within the normal range, therefore, a girl’s period within 21 days to 37 days is a normal cycle. Anything more or less than this is not normal and requires medical attention. A girl’s first menstrual period is also called menarche. At this time, the ovaries are not yet fully developed, and irregular menstruation may occur. At this stage, the amount of menstruation may be too much or too little, the number of days each time is not fixed, as little as one or two days, as much as ten days, the menstrual cycle may be variable, ranging from 20 days to a few months, are all normal phenomena, usually about 2 to 4 years will be normal. However, if they come too often or do not come for a long time, relevant treatment is needed.