A Study to Evaluate the Effect of a Contraceptive Vaginal Ring Delivering Ulipristal Acetate Combined With a Single or Repeated Levonorgestrel on Inhibition of Ovulation, Endometrial Changes and Bleeding Patterns in Normal Cycling Women

Inclusion Criteria: * Not at risk for pregnancy based on one of the following: a. subject has undergone sterilization; b. subject is monogamous and her male partner has undergone sterilization * Have regular menstrual cycles of 25-35 days duration * Have an intact uterus and both ovaries * Will be able to comply with the protocol * Capable of giving informed consent Exclusion Criteria: * Women participating in another clinical trial * Women not living in the catchment area of the clinic * Known hypersensitivity to progestins or antiprogestins * Known hypersensitivity to silicone rubber * Any chronic disease * All contraindications to oral contraceptive use, including: a. Thrombophlebitis or thromboembolic disorders; b. Past history of deep vein thrombophlebitis or thromboembolic disorders; c. Past or current cerebrovascular or coronary artery disease; d. Migraine with focal aura; e. Known or suspected carcinoma of the breast; f. Carcinoma of the endometrium or other known or suspected estrogen-dependent neoplasia; g. Undiagnosed abnormal genital bleeding; h. Cholestatic jaundice of pregnancy or jaundice with prior pill use; i. Hepatic adenomas or carcinomas; j. Known or suspected pregnancy * Desire to get pregnant during the study (through the use of reproductive technology for sterilized women or vasectomy reversal for sterilized partners) * Breastfeeding * Undiagnosed vaginal discharge or vaginal lesions or abnormalities * Women with a current abnormal Pap: In accordance…