Pregnancy TrimestersPregnancy Trimester, ThirdPregnancy Trimester, FirstPregnancyPregnancy Trimester, SecondPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalGestational AgePremature BirthInfant, PrematureInfant, NewbornPregnancy, EctopicObstetric Labor, PrematurePregnancy Complications, CardiovascularUltrasonography, PrenatalPregnancy Complications, InfectiousPregnancy, MultipleAbortion, SpontaneousPregnancy RatePregnancy in DiabeticsPregnancy Complications, NeoplasticPlacentaPre-EclampsiaPregnancy TestsPregnancy, High-RiskPregnancy, TubalInfant, Premature, DiseasesBirth WeightPregnancy in AdolescencePregnancy ProteinsAmniotic FluidAbortion, InducedFetal DeathFetal Membranes, Premature RuptureInfant, Low Birth WeightPrenatal CarePregnancy Complications, HematologicFetal Growth RetardationFetal DiseasesTrophoblastsPrenatal DiagnosisFetusPregnancy, TwinFetal DevelopmentMaternal AgeMaternal-Fetal ExchangePregnancy, UnplannedDeciduaInfant, Small for Gestational AgeChorioamnionitisProspective StudiesUterusPrenatal Exposure Delayed EffectsParityChorionic VilliTerm BirthPregnancy, UnwantedAbnormalities, Drug-InducedHypertension, Pregnancy-InducedMaternal ExposureCesarean SectionPregnancy Complications, ParasiticLabor, ObstetricRisk FactorsAbortifacient Agents, NonsteroidalPregnancy, ProlongedCrown-Rump LengthAmniocentesisTwinsCohort StudiesCongenital AbnormalitiesPregnancy MaintenancePregnancy, AbdominalDelivery, ObstetricStillbirthFertilization in VitroAbortion, HabitualChorionic Gonadotropin, beta Subunit, HumanPlacenta DiseasesAbortion, TherapeuticEmbryo ImplantationInfant, Extremely PrematureEmbryo TransferDiabetes, GestationalUterine HemorrhagePlacentationCervix UteriRetrospective StudiesDown SyndromeTocolytic AgentsPlacental CirculationMisoprostolChorionic GonadotropinProgesteronePregnancy Reduction, MultifetalInfant, Very Low Birth WeightFetal BloodParturitionAbortifacient Agents