To determine miscarriage and menstruation, mainly from the following aspects: 1. Look at the time of bleeding. If it is a menstruation, the bleeding time and the last menstruation are in a cycle, usually exactly about a month. And in the case of miscarriage, there is usually a delay in menstruation. 2. the amount of bleeding. The normal menstruation is less on the first day, more on the second day, and less on the third and fourth day, and then slowly cleans up. In the case of pre-eclampsia, the amount of bleeding is less and there is always a brown discharge. 3. The easiest and most direct way is to take a urine test. If the result of urine test paper is positive, it means miscarriage; if the urine test result is negative, it is more likely to be menstruation.