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Contraceptives, Postcoital, HormonalContraceptives, PostcoitalContraceptionContraceptives, Oral, HormonalPregnancy in AdolescenceContraception BehaviorContraception, PostcoitalContraceptive Agents, FemalePregnancyContraceptive Agents, MaleContraceptives, Oral, CombinedCoitusSex EducationPregnancy, UnwantedFamily Planning ServicesSpermatogenesis-Blocking AgentsPregnancy, UnplannedMetrorrhagiaContraceptives, Postcoital, SyntheticMedroxyprogesterone AcetateUterine HemorrhageLevonorgestrelMenstruation-Inducing AgentsContraceptive AgentsSexual BehaviorIntrauterine DevicesAdolescent Health ServicesContraceptive Devices, FemaleContraceptive DevicesSexually Transmitted DiseasesReproductive Physiological PhenomenaContraceptives, OralDesogestrelNorgestrelOvulation InhibitionLipid Metabolism DisordersIntrauterine Devices, MedicatedTransdermal PatchEthinyl EstradiolProgestinsNorethindronePregnancy ComplicationsPregnancy OutcomeSalivary alpha-AmylasesNonprescription DrugsAdolescent BehaviorDrug ImplantsPregnancy, AnimalEthinyl Estradiol-Norgestrel CombinationPregnancy, EctopicUnited StatesAbortion, InducedPregnancy RatePregnancy TestsPregnancy Trimester, FirstCondomsHIV InfectionsDelayed-Action PreparationsPregnancy Trimester, ThirdGreat BritainPregnancy Complications, CardiovascularHIV SeropositivityPregnancy TrimestersRisk FactorsSterilization, ReproductiveContraception, ImmunologicProspective StudiesSpermatogenesisPregnancy, MultipleHealth Knowledge, Attitudes, PracticeIntrauterine Devices, CopperQuestionnairesContraception, BarrierPregnancy in DiabeticsPregnancy Complications, InfectiousPregnancy Trimester, SecondPregnancy, TubalTestosteroneCohort StudiesPregnancy Complications, NeoplasticReligion and SexAbortion, SpontaneousAbortion ApplicantsAbortion, LegalReproductive Health ServicesPrimary PreventionPregnancy ProteinsPregnancy, High-RiskInfant, NewbornParityGestational AgeFertilityContraceptives, Oral, SyntheticReproductive MedicineHIV-1Pregnancy Complications, HematologicNorpregnadienesAbortifacient AgentsPre-EclampsiaSpermatocidal Agents