PregnancyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, FirstPregnancy RatePregnancy Trimester, ThirdPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultiplePregnancy in DiabeticsPregnancy Trimester, SecondPregnancy, TubalPregnancy Complications, NeoplasticPregnancy in AdolescencePregnancy Complications, InfectiousAbortion, SpontaneousPregnancy, UnplannedPregnancy ProteinsPregnancy, High-RiskPregnancy, UnwantedGestational AgeInfant, NewbornPregnancy Complications, HematologicPre-EclampsiaPregnancy, ProlongedPregnancy, TwinPlacentaFetal DeathAbortion, InducedUterusRetrospective StudiesPregnancy, AbdominalPregnancy Complications, ParasiticPrenatal CareUltrasonography, PrenatalPregnancy MaintenanceEmbryo ImplantationEmbryo TransferFertilization in VitroParityMaternal-Fetal ExchangePrenatal Exposure Delayed EffectsBirth WeightTime FactorsProspective StudiesRisk FactorsCesarean SectionPregnancy Reduction, MultifetalMaternal AgeHypertension, Pregnancy-InducedQuestionnairesTreatment OutcomeProgesteroneFetal Growth RetardationInfertility, FemalePremature BirthLabor, ObstetricAbnormalities, Drug-InducedPrenatal DiagnosisLactationCongenital AbnormalitiesFetusFetal DevelopmentDeciduaObstetric Labor, PrematureTwinsCohort StudiesMaternal ExposureChorionic GonadotropinDelivery, ObstetricAbortion, TherapeuticDiabetes, GestationalFetal DiseasesPuerperal DisordersTrophoblastsParturitionPregnant WomenAbortion, HabitualFollow-Up StudiesAbortifacient Agents, NonsteroidalInsemination, ArtificialInfertilityFertilityInfant, Low Birth WeightPreconception CareSperm Injections, IntracytoplasmicEndometriumReproductive Techniques, AssistedAmniotic FluidStillbirthGravidityPlacenta DiseasesUnited StatesMothersChorionic Gonadotropin, beta Subunit, HumanContraceptionMaternal Nutritional Physiological Phenomena