PregnancyPregnancy OutcomeAbortion, SpontaneousPregnancy ComplicationsFertilization in VitroPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, ThirdPregnancy Trimester, FirstPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy, MultiplePregnancy, TubalPregnancy RatePregnancy Trimester, SecondPregnancy in DiabeticsPregnancy Complications, NeoplasticPregnancy TestsPregnancy Complications, InfectiousPregnancy in AdolescenceGestational AgePregnancy, UnplannedPregnancy, AbdominalPregnancy, UnwantedPregnancy, High-RiskInfant, NewbornPre-EclampsiaPregnancy Complications, HematologicPlacentaAbortion, InducedFetal DeathPregnancy ProteinsUterusUltrasonography, PrenatalParityPrenatal CareBirth WeightHypertension, Pregnancy-InducedEmbryo TransferCesarean SectionPrenatal Exposure Delayed EffectsPregnancy Complications, ParasiticMaternal AgeEmbryo ImplantationPreconception CarePregnancy, ProlongedMaternal-Fetal ExchangePregnancy, TwinFetal DevelopmentPremature BirthFetal Growth RetardationTwinsDiabetes, GestationalPuerperal DisordersObstetric Labor, PrematurePregnancy MaintenanceStillbirthProgesteroneFetal DiseasesInfant, Low Birth WeightFetusRisk FactorsContraceptionPrenatal DiagnosisMaternal Nutritional Physiological PhenomenaProspective StudiesFertilityCohort StudiesPregnancy Reduction, MultifetalFamily Planning ServicesBirth IntervalsContraception BehaviorInfertility, FemalePostpartum PeriodAbnormalities, Drug-InducedLactationDeciduaLabor, ObstetricRetrospective StudiesCongenital AbnormalitiesMaternal ExposureChorionic GonadotropinTime FactorsAbortion, TherapeuticTrophoblastsAbortion, HabitualAbortifacient Agents, NonsteroidalInsemination, ArtificialDelivery, ObstetricEndometriumSperm Injections, IntracytoplasmicEstradiolDepression, PostpartumPlacenta DiseasesAmniotic FluidInfertilityPregnant WomenWeight GainGravidityCase-Control Studies