MifepristoneAbortifacient Agents, SteroidalHormone AntagonistsMisoprostolAbortifacient Agents, NonsteroidalContraceptives, Postcoital, SyntheticAbortifacient AgentsAbortion, InducedContraceptives, Oral, SyntheticMenstruation-Inducing AgentsContraceptives, PostcoitalLuteolytic AgentsContraception, PostcoitalContraceptive Agents, FemaleNorpregnadienesLevonorgestrelAdministration, IntravaginalProgestinsEndometriumProgesteroneContraceptives, OralReceptors, GlucocorticoidUterine HemorrhageMenstruationLuteal PhaseContraceptives, Oral, CombinedPregnancyGonanesCytostatic AgentsEthinyl EstradiolNorgestrelReceptors, ProgesteroneLabor Stage, FirstMenstrual CyclePregnancy Trimester, FirstContraceptives, Oral, HormonalMetrorrhagiaAdministration, SublingualPregnanediolOvulation InhibitionDanazolContraceptives, Postcoital, HormonalMegestrolAlcohol-Induced Disorders, Nervous SystemVacuum CurettageEmbryo ImplantationFallopian TubesAlgestoneGlucocorticoidsOxytocicsIntrauterine DevicesAbortion, LegalMenorrhagiaCorticosteronePessariesClostridium sordelliiDexamethasoneContraception BehaviorLeiomyomaReceptors, MineralocorticoidPlacebosDouble-Blind Method