It is normal to have a small amount of bleeding at the beginning and end of the period, which is pink when mixed with vaginal secretions. Whether menstruation is normal from the following points: 1, menstrual cycle, usually in 28-30 days, early or postponed 3-5 days is also normal; 2, menstrual period, most are 3-5 days, a few 2-8 days, the first day the blood volume is not much, the second and third day increase, and then gradually reduce until clean; 3, the amount of menstrual blood, varies from person to person, usually 20-100ml, 3-5 times a day to change sanitary napkin or toilet paper; 4, the color of menstrual blood, normal is dark red. 5, in addition to long-term dieting and weight loss, endocrine disorders, malnutrition, trauma blood loss, postpartum hemorrhage, do larger surgery, etc. can lead to lighter color of menstrual blood. In this case, it is better to consult a hospital to identify the cause and then treat it, and pay attention to warmth and cleanliness of the vulva during menstruation to avoid infection.