Antepartum Etonogestrel Contraceptive Implant Insertion at Term

Inclusion Criteria: * Pregnant women (ages 18-34 years) ≥37 weeks gestational age who are interested in using an ENG contraceptive implant for their postpartum birth control method. * Women with a history of at least one uncomplicated vaginal delivery at term who have received routine prenatal care (at least five visits) including an anatomy ultrasound with confirmed dating. Exclusion Criteria: * Women outside the gestational age outlined above. * Women who are seen outside of the enrolling clinics. * Women 35 years and older at the time of anticipated delivery, as these women meet the clinical definition of advanced maternal age which has been associated with increased adverse events in pregnancy. * Women with any condition that necessitates a medically indicated delivery (e.g. diabetes mellitus, any hypertensive disorder), multiple gestations, fetal anomalies, Class III obesity (body mass index \>40), concurrent use of either an injectable or vaginal progestin, and any concerns related to ENG implant use based on the US Medical Eligibility Criteria for Contraceptive Use (defined as a class 3 or 4 recommendation).