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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, PostcoitalMestranolNorethindroneVaccines, ContraceptivePregnancy, UnplannedSterilization, ReproductivePregnancy, UnwantedPregnancyMedroxyprogesterone AcetateSpermatocidal AgentsContraception, PostcoitalMenstruationAbortion, InducedIntrauterine Devices, CopperNorethynodrelEthynodiol DiacetateContraception, ImmunologicNorpregnenesEthinyl Estradiol-Norgestrel CombinationProgestinsDelayed DiagnosisContraceptives, Oral, SequentialContraceptives, Postcoital, HormonalPrenatal DiagnosisEarly DiagnosisSterilization, TubalSensitivity and SpecificityRisk FactorsHealth Knowledge, Attitudes, PracticeMenstrual CycleAndrostenesParityProgesterone CongenersIntrauterine Devices, MedicatedContraceptive Devices, MaleMenstruation DisturbancesRetrospective StudiesTime FactorsPregnancy in AdolescenceMegestrolDiagnosisAge FactorsContraceptives, Postcoital, SyntheticDrug ImplantsSex EducationCase-Control StudiesSpermatogenesis-Blocking AgentsOvulation InhibitionFertilityMedroxyprogesteroneCondomsUterine HemorrhageSexual BehaviorQuestionnairesNorpregnadienesTransdermal PatchProspective StudiesEthisteroneMetrorrhagiaLogistic ModelsEstradiol CongenersUnited StatesCohort StudiesEstrogensCross-Sectional StudiesCoitusNonoxynolDiagnostic ErrorsAbortion ApplicantsBiopsyAbortion, LegalSexually Transmitted DiseasesXanthurenatesWomen's HealthMarriageReproductive Health ServicesFollow-Up StudiesReproductive HistoryAmenorrheaTomography, X-Ray ComputedSocioeconomic FactorsIncidenceCoitus Interruptus