The Effect of Birth Control Methods on Anti-Mullerian Hormone (AMH) Levels

Inclusion Criteria: * English-speaking * Female * Age 25-40 * Electing one of the following contraceptive methods: tubal ligation, Essure, levonorgestrel IUD * Ability to understand study procedures and to comply with them for the entire length of the study * Willingness to comply with follow-up visit requirements Exclusion Criteria: * Age \<25 or \>40 at initiation or completion of the study * Prior oophorectomy or salpingectomy * Prior surgery of the ovaries or fallopian tubes * Prior ovarian, uterine, or fallopian tube cancers * Prior ovarian, uterine, or fallopian tube radiation exceeding \>200rads * Prior platinum-based or alkalizing chemotherapy * Current cancer (any form) * Current pregnancy * Allergy to any of the components of the selected devices (titanium, rubber, nickel, plastic, silicone) * Current drug or alcohol use or dependence that, in the opinion of the site investigator, would interfere with adherence to study requirements * Inability or unwillingness of a potential participant to give written informed consent * Inability for the potential participant to consent for herself