Normally, a woman's menstrual period lasts from two to seven days. If your body is anemic and weak, your menstrual flow will be low and short-lived. If your body is healthy and full of blood, your menstrual flow will usually be clean in about six or seven days. Now you only have two or three days of menstruation and the menstrual flow is small, it is considered to be due to the lack of qi and blood, you can eat more blood tonic food conditioning, or take wuji baifeng pills, gelatin supplementation granules, compound gelatin syrup and other drugs to regulate.