Birth RateContraceptives, OralContraceptives, Oral, CombinedContraceptive AgentsContraceptives, Oral, HormonalContraceptive Agents, FemaleContraceptives, Oral, SyntheticContraceptive DevicesContraceptionLive BirthPregnancyContraceptive Devices, FemaleContraception BehaviorPregnancy in AdolescenceContraceptive Agents, MaleBirth WeightFamily Planning ServicesPremature BirthPregnancy RateIntrauterine DevicesEthinyl EstradiolDesogestrelPregnancy OutcomeNorgestrelLevonorgestrelContraceptives, PostcoitalEmbryo TransferFertilization in VitroIllegitimacyMestranolNorethindroneInfant, Low Birth WeightInfant, NewbornMultiple Birth OffspringVaccines, ContraceptiveReproductive Techniques, AssistedMaternal AgePregnancy, UnplannedAbortion, InducedPregnancy, MultipleBirth CertificatesSterilization, ReproductiveOvulation InductionOocyte RetrievalPregnancy, UnwantedInfertility, FemaleFertilitySperm Injections, IntracytoplasmicEmbryo ImplantationAbortion, LegalVital StatisticsInfertilityMedroxyprogesterone AcetateParityAbortion, SpontaneousContraception, PostcoitalFollicle Stimulating Hormone, HumanSpermatocidal AgentsCryopreservationReproductive Control AgentsUnited StatesMenstruationIntrauterine Devices, CopperNorethynodrelGamete Intrafallopian TransferPregnancy ComplicationsFertility Agents, FemaleEthynodiol DiacetateGestational AgeContraception, ImmunologicSingle Embryo TransferCesarean SectionClomipheneProgestinsAbortion, HabitualNorpregnenesEthinyl Estradiol-Norgestrel CombinationBirth OrderInfant MortalityCohort StudiesRisk FactorsContraceptives, Oral, SequentialDelivery, ObstetricInsemination, Artificial, HomologousContraceptives, Postcoital, HormonalFamily Planning PolicyPrenatal CareAge FactorsMarital StatusRetrospective StudiesNational Center for Health Statistics (U.S.)Parental NotificationEmbryo Culture TechniquesSterilization, TubalNafarelinSingle ParentPaternal AgeBirth IntervalsTwinsMenstrual Cycle