PregnancyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, FirstPregnancy Trimester, ThirdPregnancy RatePregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultiplePregnancy Trimester, SecondPregnancy in DiabeticsPregnancy, TubalPregnancy Complications, NeoplasticPregnancy in AdolescencePregnancy Complications, InfectiousPregnancy, High-RiskAbortion, SpontaneousPregnancy, UnplannedPregnancy ProteinsGestational AgePregnancy, UnwantedInfant, NewbornRisk FactorsPregnancy Complications, HematologicPre-EclampsiaPlacentaPregnancy, ProlongedPregnancy, TwinFetal DeathAbortion, InducedUterusUltrasonography, PrenatalPregnancy, AbdominalPregnancy Complications, ParasiticPrenatal CarePregnancy MaintenanceEmbryo ImplantationEmbryo TransferFertilization in VitroProspective StudiesParityMaternal-Fetal ExchangeBirth WeightPrenatal Exposure Delayed EffectsRetrospective StudiesCesarean SectionMaternal AgeHypertension, Pregnancy-InducedPregnancy Reduction, MultifetalFetal Growth RetardationPremature BirthCohort StudiesRisk AssessmentTime FactorsProgesteroneInfertility, FemalePrenatal DiagnosisObstetric Labor, PrematureFetusFetal DevelopmentAbnormalities, Drug-InducedCongenital AbnormalitiesDiabetes, GestationalLabor, ObstetricLactationTwinsRiskDeciduaChorionic GonadotropinMaternal ExposureDelivery, ObstetricFetal DiseasesAbortion, TherapeuticAbortion, HabitualTreatment OutcomePuerperal DisordersTrophoblastsInfant, Low Birth WeightFollow-Up StudiesInsemination, ArtificialAbortifacient Agents, NonsteroidalFertilityPregnant WomenPlacenta DiseasesAmniotic FluidSperm Injections, IntracytoplasmicEndometriumPreconception CareStillbirthPrevalenceInfertilityCase-Control StudiesLogistic ModelsChorionic Gonadotropin, beta Subunit, HumanQuestionnairesGravidityReproductive Techniques, Assisted