Inclusion Criteria:  pregnant women with gastational age between 28 weeks and 36 weeks and 6 days who are diagnosed with preterm prelabour rupture of membranes  Exclusion Criteria:  clinical suspicion of chorioamnionitis Patients refusal to participate in clinical research. significant vaginal bleeding previous tocolysis use after rupture of membranes nonreassuring fetal heart tracing fetal anomalies significant maternal medical complications, and maternal or fetal indication for delivery