It is time for menstruation, but only a little bit. It may be due to lack of qi and blood in the body or endocrine disorder. Because the endometrium is thin, it will shed and bleed less when you have your period. You can see your doctor for an ultrasound examination to understand the condition of the endometrium. You can also have a sex hormone six test on the third day of your period to see the endocrine situation, and then make a comprehensive judgment and give appropriate treatment measures. If the estrogen and progesterone levels are low, consider poor ovarian function, then you can take short-acting contraceptives for a period of time under the guidance of a doctor to help regulate menstruation. If you are usually weak and have a deficiency of qi and blood, you can use qi and blood tonics under the guidance of a doctor and choose herbal classes to treat qi and blood deficiency. Also strengthen nutrition and avoid eating spicy and stimulating food.