CDB-2914 is a manmade hormone similar to the hormones cortisol and progesterone. The National Institute of Child Health and Human Development is evaluating the ability of this drug to treat reproductive conditions. Institute studies have shown that CDB-2914 can increase the time to produce a mature egg in the ovary, and cause an early menstrual period, CDB-2914 might be used to treat fibroids and endometriosis pain. As part of its evaluation for these purposes, this study will determine if absorption of crystalline and micronized powder forms of CDB-2914 result in the same blood levels of the drug.