Normally in the fourth month of pregnancy, there should not be amniotic fluid flowing out. However, if you encounter an accidental phenomenon or strenuous exercise and suffer an accidental impact that causes premature rupture of the amniotic sac, you will be prone to amniotic fluid flow. If this happens, you should go to the hospital for a timely checkup and then determine the right treatment to preserve the fetus to avoid excessive amniotic fluid flow, which may lead to fetal miscarriage or cause fetal ischemia and hypoxia in the uterus leading to asphyxia. If the flow of water is not particularly large, vaginitis should be considered. If trichomoniasis is present, the discharge will be large and watery. Increased discharge can also occur after dampness, cold or eating cold food. This situation needs to be ruled out in time and treated symptomatically. If vaginitis is identified, it can be treated with anti-inflammatory medication intravaginal. Try to pay attention to hygiene and washing.