PregnancyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, FirstUltrasonographyPregnancy Trimester, ThirdPregnancy RateUltrasonicsPregnancy Trimester, SecondUltrasonic TherapyPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsUltrasonography, PrenatalPregnancy, MultipleHigh-Intensity Focused Ultrasound AblationPregnancy, TubalPregnancy in DiabeticsUltrasonography, InterventionalGestational AgePregnancy Complications, NeoplasticPregnancy in AdolescenceMicrobubblesPregnancy Complications, InfectiousAbortion, SpontaneousPregnancy, High-RiskInfant, NewbornPregnancy ProteinsPregnancy, UnplannedPregnancy, UnwantedPregnancy, ProlongedPregnancy Complications, HematologicTransducersUltrasonography, DopplerProspective StudiesFetal DeathPlacentaPregnancy, TwinPre-EclampsiaFetal DiseasesUterusUltrasonography, Doppler, ColorAbortion, InducedPregnancy, AbdominalSensitivity and SpecificityFertilization in VitroEmbryo ImplantationEmbryo TransferPrenatal DiagnosisPregnancy Complications, ParasiticPrenatal CarePregnancy MaintenanceParityBirth WeightCesarean SectionFetusFetal DevelopmentMicroscopy, AcousticFetal Growth RetardationMaternal-Fetal ExchangeMaternal AgeImaging, Three-DimensionalReproducibility of ResultsPrenatal Exposure Delayed EffectsRetrospective StudiesCongenital AbnormalitiesEndosonographyContrast MediaRisk FactorsTime FactorsPregnancy Reduction, MultifetalEchoencephalographyAbortion, TherapeuticInfertility, FemaleProgesteroneHypertension, Pregnancy-InducedUltrasonography, Doppler, PulsedPremature BirthPredictive Value of TestsObstetric Labor, PrematureTwinsSonicationLabor, ObstetricUterine HemorrhageDelivery, ObstetricChorionic GonadotropinEndometriumPlacenta DiseasesLactationBlood Flow VelocityAbnormalities, Drug-InducedUltrasonography, MammaryDeciduaCrown-Rump LengthAbortifacient Agents, NonsteroidalPuerperal DisordersFluorocarbonsMaternal Exposure