The term “great aunt” generally stands in for menstruation. The blood of a miscarriage is somewhat different from menstrual blood in terms of time, color, amount of blood, pain, and blood HCG (human chorionic gonadotropin) indicators. 1. Timing: Menstruation is cyclical, whereas the prerequisite for a miscarriage to occur is pregnancy, so there is a history of menopause in a miscarriage, whereas menstruation does not. 2. Color: The color of blood from a miscarriage may be bright red, pink or brown. Menstrual bleeding is usually dark red or dark red. 3. Amount of blood: The general amount of blood from miscarriage is not a lot, less than the amount of menstruation, and can be used with pads, while menstrual blood exists in a certain degree of regularity, the amount of bleeding is larger, and you need to use a sanitary napkin. 4. Sense of pain: miscarriage bleeding is usually accompanied by paroxysmal pain in the lower abdomen, menstrual period may be uncomfortable feeling in the lower abdomen, may be hidden pain or persistent pain, but usually does not appear paroxysmal pain. 5. Human chorionic gonadotropin (HCG) index: If it is miscarriage, the HCG index will be increased, if it is menstruation, the HCG index is normal. If patients are not sure whether they have pre-menstrual flow, it is recommended that they go to the hospital to have blood tests for human chorionic gonadotropin in time. The best way to distinguish early miscarriage from menstrual bleeding is to use human chorionic gonadotropin to do so.