PregnancyIncidencePregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, FirstPregnancy RatePregnancy Trimester, ThirdRisk FactorsInfant, NewbornPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultipleRegistriesCohort StudiesPregnancy in DiabeticsAge DistributionPregnancy, TubalPregnancy Trimester, SecondPregnancy Complications, NeoplasticPregnancy Complications, InfectiousPregnancy in AdolescenceProspective StudiesRetrospective StudiesAbortion, SpontaneousUnited StatesTime FactorsSex DistributionPregnancy ProteinsPregnancy, UnplannedPregnancy, High-RiskGestational AgePregnancy, UnwantedPoisson DistributionFollow-Up StudiesPopulation SurveillanceAge FactorsPregnancy Complications, HematologicDenmarkPrevalencePre-EclampsiaSEER ProgramPregnancy, ProlongedPregnancy, TwinPlacentaFetal DeathParityAbortion, InducedRiskUterusPregnancy, AbdominalRisk AssessmentPregnancy Complications, ParasiticNeoplasmsUltrasonography, PrenatalJapanPregnancy MaintenanceEmbryo ImplantationFertilization in VitroEmbryo TransferPrenatal CarePrenatal Exposure Delayed EffectsTreatment OutcomeSex FactorsBirth WeightMaternal-Fetal ExchangeMaternal AgeEuropean Continental Ancestry GroupMinnesotaSeasonsSwedenCesarean SectionConfidence IntervalsEpidemiologic MethodsRegression AnalysisSmokingCase-Control StudiesPregnancy Reduction, MultifetalHypertension, Pregnancy-InducedLongitudinal StudiesNetherlandsCaliforniaOdds RatioFetal Growth RetardationProgesteroneProportional Hazards ModelsEthnic GroupsPremature BirthHospitalizationAfrican Continental Ancestry GroupCongenital AbnormalitiesInfertility, FemaleSocioeconomic FactorsHIV InfectionsSurvival RateBreast NeoplasmsQuestionnairesFrance