Rupture of amniotic fluid is called rupture of membranes. rupture of membranes can occur at 18 weeks and is called preterm rupture of membranes, which can lead to inevitable abortion, miscarriage, and incomplete abortion. Rupture of membranes occurs before labor and is called preterm rupture of membranes.Preterm rupture of membranes at 18 weeks is called premature rupture of membranes at term. At this time, perinatal healing is poorer due to the smaller gestational period. Reproductive tract infections, uneven stress on the fetal membranes, and increased pressure in the traumatized amniotic cavity can all lead to premature rupture of membranes. Clinical manifestations include a sudden sensation of more fluid coming out of the vagina without other symptoms such as abdominal pain. The principle of management of premature rupture of membranes in the underterm fetus is that when the risk of infection exceeds the risk of complications of preterm labor, the pregnancy should be terminated immediately. premature rupture of membranes at 18 weeks can cause inevitable abortion, miscarriage, incomplete abortion and other conditions, and most advocate inducing labor, and should not continue the pregnancy. When premature rupture of membranes occurs, you should go to the hospital in time and be treated under the guidance of your doctor.