Pregnancy TrimestersPregnancyPregnancy Trimester, FirstPregnancy Trimester, ThirdPregnancy Trimester, SecondPregnancy ComplicationsPregnancy OutcomePregnancy, AnimalPregnancy, EctopicPregnancy Complications, CardiovascularPregnancy RatePregnancy TestsPregnancy, MultiplePregnancy in DiabeticsPregnancy Complications, NeoplasticGestational AgePregnancy Complications, InfectiousAbortion, SpontaneousPregnancy, TubalPregnancy in AdolescenceUltrasonography, PrenatalPregnancy ProteinsPlacentaPregnancy, High-RiskPre-EclampsiaInfant, NewbornPregnancy, UnplannedPregnancy Complications, HematologicAbortion, InducedPregnancy, UnwantedFetal DeathPregnancy, TwinPrenatal CarePregnancy, ProlongedUterusTrophoblastsMaternal-Fetal ExchangePregnancy Complications, ParasiticPrenatal DiagnosisFetal DiseasesBirth WeightPrenatal Exposure Delayed EffectsPregnancy, AbdominalFetal Growth RetardationPregnancy MaintenanceDeciduaFetusParityFetal DevelopmentAbnormalities, Drug-InducedProspective StudiesEmbryo ImplantationMaternal AgeHypertension, Pregnancy-InducedFertilization in VitroEmbryo TransferCesarean SectionPremature BirthMaternal ExposureAbortifacient Agents, NonsteroidalChorionic VilliAmniotic FluidObstetric Labor, PrematureCongenital AbnormalitiesAbortion, TherapeuticPregnancy Reduction, MultifetalAbortion, HabitualLabor, ObstetricDiabetes, GestationalChorionic Gonadotropin, beta Subunit, HumanChorionic GonadotropinProgesteroneCrown-Rump LengthRisk FactorsTwinsLactationInfant, Low Birth WeightInfertility, FemalePlacenta DiseasesPuerperal DisordersCohort StudiesTime FactorsRetrospective StudiesPlacentationPregnant WomenDelivery, ObstetricPlacental CirculationMaternal Nutritional Physiological PhenomenaEndometriumDown SyndromePreconception CareUterine HemorrhageQuestionnairesAbortifacient AgentsMisoprostolHydatidiform MoleAmniocentesisInfant, Small for Gestational AgeStillbirthSperm Injections, Intracytoplasmic