Sonographic Parameters and Risk of Antepartum Hemorrhage in Asymptomatic Women With Placenta Previa: A Cohort Study

Inclusion Criteria: * Asymptomatic women diagnosed with placenta previa according to RCOG (GTG No. 27a, 2018): placenta lies directly over the internal os for pregnancies more than 16 weeks' gestation on transabdominal or transvaginal scanning. * Gestational age between 28 till 37 weeks' gestation (as delivery should be considered between 36 and 37 weeks of gestation for women presenting with uncomplicated placenta previa) Exclusion Criteria: * Multiple pregnancies. * Threatened preterm labor or preterm rupture of membranes. * History of bleeding in the current pregnancy. * Polyhydraminos (AFI \> 25 cm). * History of cervical surgery (cone biopsy). * Presence of cervical cerclage. * Maternal use of vaginla progesterone. * History of maternal disease (hypertensive, DM, Cardiac). * Fetal malformation or growth restriction