Amniotic fluid coming out once in the third trimester of pregnancy and not coming out again may be due to the fact that the pregnant woman does experience water breakage, which is usually abnormal; or it may be due to the fact that the pregnant woman mistakes vaginal discharge for water breakage. 1. Water breakage: If the pregnant woman does experience water breakage, a large amount of fluid similar to urine may be observed. Some of them may stop on their own. This is rare, but regardless of whether it stops or not, water breaking in the third trimester of pregnancy is abnormal and requires vigilance for problems such as intrauterine infection or abnormal uterine development. 2. More vaginal discharge: Some pregnant women mistake vaginal discharge for water breaking, but the cervical mucus plug is not amniotic fluid and its amount is very small. If a pregnant woman does not experience water breakage, there may be no fluid coming out from behind, so some pregnant women will mistake their water breakage, which is usually not accompanied by other symptoms and is normal. If a pregnant woman’s water breaks, accompanied by abdominal pain and other symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.