Immediate postpartum placement of IUDs is a relatively new clinical practice in the United States; as such there is no recommended or "standard" follow up protocol in this situation. For IUDs placed outside of the postpartum period, the standard follow up is a string check (speculum exam to confirm presence of strings at cervical os) 2-6 weeks after IUD placement. If strings are not visible, or if the patient experiences symptoms concerning for expulsion, a transvaginal ultrasound will be performed. Once correct placement is confirmed by ultrasound, patients without visible strings generally have ultrasounds yearly to confirm placement. Based on this standard practice, patients with visible strings will have the ultrasound only for research purposes. Additionally, the three month ultrasound will be only for research purposes, even in those without visible strings.