Vaginal Progesterone Versus Cervical Cerclage for Pregnant Women With Short Cervix and History of PTL and/or MTM

Inclusion Criteria: * Women with singleton pregnancy. * History of preterm labor and/or midtrimester miscarriage in a previous pregnancy. * Cervical length of 15-25 mm by transvaginal sonography (TVS) at 16-24 weeks of gestation. Exclusion Criteria: * Age \< 20 or \> 35 years. * Congenital uterine malformation. * Multifetal pregnancy. * Known major fetal structural or chromosomal abnormality. * Known allergy or contraindication (relative or absolute) to progesterone therapy. * Presence of contraindication to cervical cerclage. * Medical conditions complicating pregnancy. * Vaginal bleeding.