Pregnancy Trimester, SecondPregnancy Trimester, FirstAborted FetusAbortifacient Agents, NonsteroidalMisoprostolPregnancyAbortion, InducedAdministration, IntravaginalPregnancy Trimester, ThirdPregnancy TrimestersAbortion, SpontaneousAbortifacient Agents, SteroidalGestational AgePregnancy ComplicationsPregnancy OutcomeDeciduaUltrasonography, PrenatalFetal DiseasesPrenatal DiagnosisPregnancy, AnimalPre-EclampsiaPregnancy Complications, NeoplasticPregnancy Complications, CardiovascularPlacentaPregnancy Complications, InfectiousDown SyndromeAmniotic FluidPregnancy, EctopicInfant, NewbornFetusFetal DevelopmentAmniocentesisAbortifacient AgentsFetal Growth RetardationFetal DeathPregnancy, MultiplePregnancy in DiabeticsPregnancy, High-RiskTrophoblastsPregnancy ProteinsCrown-Rump LengthBirth WeightChorionic VilliMaternal ExposurePregnancy Complications, HematologicPrenatal CarePregnancy RatePrenatal Exposure Delayed EffectsMaternal AgeAbortion, TherapeuticPremature BirthProspective StudiesMaternal-Fetal ExchangeObstetric Labor, PrematurePlacental CirculationUterusFetal HeartPregnancy TestsHypertension, Pregnancy-InducedChorionic Gonadotropin, beta Subunit, HumanUterine ArteryDilatation and CurettageParityPregnancy, TubalPostpartum PeriodTrisomyalpha-FetoproteinsEstriolCongenital AbnormalitiesPregnancy Complications, ParasiticInfant, Small for Gestational AgeAbortion, HabitualAbnormalities, Drug-InducedPregnancy in AdolescencePregnancy-Associated Plasma Protein-AUterine HemorrhageChorionic Villi SamplingNuchal Translucency MeasurementMaternal Nutritional Physiological PhenomenaCesarean SectionPlacenta DiseasesUterine RuptureAbortion, ThreatenedChorionic GonadotropinEmbryonic and Fetal DevelopmentNasal BoneHydatidiform MoleTwinsDiabetes, GestationalFetal Membranes, Premature RuptureInfant, Low Birth WeightAbortion, LegalCohort StudiesRetrospective StudiesRisk FactorsPregnancy, UnplannedFetal BloodUltrasonography, Doppler, ColorFetoscopyPregnancy, Twin