When you have your period, if there is no flow or there is blood only when you wipe, if it is on the 1st day, because the endometrium is shed less on the 1st day, there may be such a situation and it is normal. If this is still the case on the 2nd or 3rd day, then it is abnormal and there will be a low menstrual flow. It is recommended to drink more hot boiled water or brown sugar water to help the uterine lining shed, which can increase the menstrual flow. You can also take oral medication, such as motherwort pellets, to regulate the menstrual cycle and help the endometrium shed, which can also increase the menstrual flow. If the condition occurs simply once, it should not be a big problem. If this happens again in the future, it is recommended to go to the hospital for a gynecological ultrasound to look at the condition of the endometrium and rule out any abnormal endometrial manifestations. Also, endocrine hormone tests should be performed. Sometimes endocrine hormone abnormalities may also cause low menstrual flow.