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Contraceptives, OralContraceptives, Oral, CombinedContraceptive AgentsContraceptives, Oral, HormonalContraceptive Agents, FemaleContraceptives, Oral, SyntheticContraceptive DevicesContraceptionContraceptive Devices, FemaleContraception BehaviorContraceptive Agents, MaleIntrauterine DevicesFamily Planning ServicesEthinyl EstradiolDesogestrelNorgestrelLevonorgestrelContraceptives, PostcoitalWomen's HealthWomenMestranolNorethindroneVaccines, ContraceptivePregnancy, UnplannedSterilization, ReproductivePregnancyPregnancy, UnwantedMedroxyprogesterone AcetateMenstruationAbortion, InducedContraception, PostcoitalSpermatocidal AgentsIntrauterine Devices, CopperProgestinsNorethynodrelParityNorpregnenesEthynodiol DiacetateContraception, ImmunologicEthinyl Estradiol-Norgestrel CombinationHealth Knowledge, Attitudes, PracticeContraceptives, Oral, SequentialWomen's Health ServicesSterilization, TubalContraceptives, Postcoital, HormonalRisk FactorsQuestionnairesPregnant WomenAge FactorsMenstruation DisturbancesBattered WomenProgesterone CongenersIntrauterine Devices, MedicatedAndrostenesCross-Sectional StudiesWomen's RightsCase-Control StudiesMenstrual CycleCohort StudiesLogistic ModelsFertilityContraceptive Devices, MaleUnited StatesUterine HemorrhagePostpartum PeriodMenopauseEstrogensCondomsSocioeconomic FactorsMegestrolSex EducationDrug ImplantsSex FactorsMedroxyprogesteronePregnancy in AdolescencePostmenopauseContraceptives, Postcoital, SyntheticTime FactorsPremenopauseOvulation InhibitionMarriageSpermatogenesis-Blocking AgentsNorpregnadienesTransdermal PatchEstradiol CongenersUterine Cervical NeoplasmsSexual BehaviorEthisteroneCoitusSexually Transmitted DiseasesAmenorrheaReproductive HistoryOdds RatioVaginaVaginal SmearsAbortion ApplicantsMetrorrhagiaWomen, WorkingIncidenceRisk