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Contraceptives, PostcoitalContraceptives, Postcoital, HormonalContraceptives, OralCoitusContraceptives, Oral, CombinedMetrorrhagiaContraceptive AgentsMenstruation-Inducing AgentsContraceptives, Oral, HormonalContraceptives, Postcoital, SyntheticContraceptive Agents, FemaleUterine HemorrhageEthinyl EstradiolContraceptives, Oral, SyntheticContraceptive DevicesContraceptionContraceptive Devices, FemaleContraception, PostcoitalContraception BehaviorContraceptive Agents, MaleIntrauterine DevicesFamily Planning ServicesDesogestrelNorgestrelLevonorgestrelPregnancyMestranolNorethindroneVaccines, ContraceptivePregnancy, UnplannedSterilization, ReproductivePregnancy, UnwantedMedroxyprogesterone AcetateSpermatocidal AgentsNorethynodrelMenstruationIntrauterine Devices, CopperEthynodiol DiacetateContraception, ImmunologicAbortion, InducedNorpregnenesProgestinsEthinyl Estradiol-Norgestrel CombinationSynthetic BiologyContraceptives, Oral, SequentialSterilization, TubalGenes, SyntheticProgesterone CongenersAndrostenesMenstrual CycleParityIntrauterine Devices, MedicatedHealth Knowledge, Attitudes, PracticeContraceptive Devices, MaleMegestrolPregnancy in AdolescenceMenstruation DisturbancesDrug ImplantsSex EducationMedroxyprogesteroneAmpyroneSpermatogenesis-Blocking AgentsOvulation InhibitionNorpregnadienesFertilityCondomsSexual BehaviorTransdermal PatchEthisteroneMolecular Sequence DataEstrogensAmino Acid SequenceRisk FactorsTime FactorsNonoxynolAbortion ApplicantsXanthurenatesPeptidesAge FactorsAbortion, LegalReproductive Health ServicesCase-Control StudiesDeltaretrovirus AntibodiesQuestionnairesWomen's HealthReproductive HistoryLogistic ModelsSexually Transmitted DiseasesCoitus InterruptusAmenorrheaChlormadinone AcetateBirth RateAnimals, NewbornPostpartum Period