Prophylactic Cervical Cerclage in Twin Pregnancies With Non-shortened Cervix

Inclusion Criteria: * Age between 18-50 years. * Dichorionic twins. * History of ≥1 preterm birth. * Transvaginal sonographic cervical length is ≥25 mm at 14-20 weeks gestational age. * Asymptomatic. Exclusion Criteria: * Triplets and quadruplets. * Monochorionic twins. * Threatened/ inevitable miscarriage * Bulging membranes through the external os. * Extremes of age. * Major fetal anomalies. * Known cases with uterine anomalies e.g. bicornuate uterus, uterus didelphis… etc. * Fetal demise. * Fetal reduction in the current pregnancy.