Labor Induction and Maternal BMI, Comparison of Different Pre-induction Cervical Ripening Methods

Inclusion Criteria: * Age 18 years of age or older. * Diagnosed to be pregnant (al least 37 weeks of gestation) with a medical indication for labor induction, including: postdate pregnancy, preeclampsia, gestational or chronic hypertension, Gestational Diabetes Mellitus at term, Oligohydramnios, Polyhydramnios, fetal growth restriction, maternal background disease necessitating delivery, Isoimmunisation, maternal Thrombophilia, intrahepatic cholestasis of pregnancy. * Having a Bishop score of 4 points or less. * Diagnosed as having singleton pregnancy at term (37 weeks at least) in a vertex presentation, with intact membranes, and absence of significant regular uterine contraction. * Willingness to comply with the protocol for the duration of the study. * Has agreed and signed an informed consent after given oral and written explanation. Exclusion Criteria: * Anay contraindication for a vaginal delivery (i.e. placenta previa, non vertex presentation, estimated fetal weight of less than 4500 gr). * Ruptured membranes. * Previous cesarian section or presence of any uterine scar. * Documented labor with four or more spontanous uterine contractions per hour. * Suspected fetal distress necessitating immediate intervention. * Proven malignancy of the cervix. * Active vaginal bleeding. * Active inflammatory or purulent condition of the lower genital tract. * Active asthma.