This study is designed to investigate whether LCS12 is associated with an increased risk of unintended pregnancy compared to Mirena and to copper IUDs. The objective is to assess among new users the risks of certain events (e.g. contraceptive failure rate, ectopic pregnancy, uterine perforation, and PID) associated with the use of LCS12 compared with the established hormonal IUD Mirena, and compared with established copper IUDs during standard clinical practice. In addition, drug utilization patterns will be described.