iv. Have a negative urine pregnancy test at the admission visit. v. Have a negative chlamydia test at the admission visit. vi. Not be at risk for pregnancy. They will be consistently using a non-hormonal contraception method, have a surgically sterile male partner with a vasectomy, be abstinent, or be in a same-sex relationship from the screening visit through the first study cycle. After starting the combined OC (see Visit 4 below), use of a non-hormonal method is no longer required.