Does Oral Desogestrel Prior to Insertion of the Etonogestrel Subdermal Implant Improve Continuation Rate at One Year?

Study and treatment periods 1 year of patient recruitment 15 months of follow up (90 days OD plus 1 year Implant or 1 year Implant) Measurements and Procedures: Assessment of premature ablation (PA) in months 3-12 (ESI only) or 3-15 (OD+ESI). This will require a contact with all patients at 12/15 months to verify if implant is still in place, and if it was removed, why (and possibly to also reassess symptoms). Women with known PA can be exempted from this follow-up. In case of PA, reasons will be explored and questioned. * Assessment of symptoms at 3 months only (bleeding calendar and satisfaction questionnaire, see below) * Assessment of willingness to receive implant at 3 months in OD+ESI group data collection is limited to these items, in order to limit burden on participants, and to focus resources on high quality of data (as opposed to quantity).