The difference between early pregnancy miscarriage and normal menstruation is mainly as follows: 1. In early pregnancy miscarriage, the HCG blood test measurement value is elevated, suggesting pregnancy. 2. In the case of a normal menstrual flow, the blood HCG assay is normal. 2. In terms of timing, when early pregnancy bleeds, it is usually after a few days of delayed menstruation. The normal menstrual flow is usually normal according to the usual menstrual cycle.3. Accompanying symptoms, early pregnancy with symptoms of miscarriage will usually have obvious abdominal pain and backache. Before that, there will be nausea, vomiting, weakness, drowsiness, frequent urination and other early pregnancy reactions. In normal menstrual flow, there is usually no obvious abdominal pain and lumbar acidity, and there is no obvious gastrointestinal reaction, and early pregnancy symptoms such as frequent urination and drowsiness before this. 4. duration, early pregnancy miscarriage will have longer bleeding time if the miscarriage is not clean. Normal menstrual flow, bleeding time is generally relatively fixed.