Bed RestPregnancyHead-Down TiltWeightlessness SimulationPregnancy OutcomePregnancy ComplicationsWeightlessness CountermeasuresRestPregnancy, AnimalCardiovascular DeconditioningPregnancy, EctopicSpace FlightBedsPregnancy Trimester, FirstPregnancy Trimester, ThirdWomen's HealthWomenPregnancy RateWeightlessnessPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultiplePregnancy Complications, InfectiousPregnancy Trimester, SecondPregnancy in DiabeticsOrthostatic IntolerancePregnancy, TubalPregnancy Complications, NeoplasticAbortion, SpontaneousPregnancy in AdolescenceLower Body Negative PressurePregnant WomenPregnancy, High-RiskPregnancy, UnplannedInfant, NewbornTime FactorsPregnancy ProteinsPre-EclampsiaPregnancy Complications, HematologicPregnancy, UnwantedGestational AgePrenatal CareParityAbortion, InducedPlacentaPregnancy Complications, ParasiticPregnancy, ProlongedRisk FactorsBattered WomenBed OccupancyPregnancy, TwinUterusCohort StudiesPlasma VolumeSupine PositionMuscle, SkeletalFetal DeathFertilization in VitroInfertility, FemaleUltrasonography, PrenatalMuscular AtrophyExerciseCesarean SectionEmbryo ImplantationEarly AmbulationPregnancy, AbdominalEmbryo TransferBirth WeightMaternal AgeQuestionnairesHypotension, OrthostaticPregnancy MaintenanceMaternal-Fetal ExchangePrenatal Exposure Delayed EffectsWomen's Health ServicesRetrospective StudiesUterine Cervical IncompetenceCross-Sectional StudiesDelivery, ObstetricHypovolemiaCase-Control StudiesTreatment OutcomeAbortion, ThreatenedProgesteroneVascular CapacitanceWomen's RightsDiabetes, GestationalFollow-Up StudiesAge FactorsLabor, ObstetricReference ValuesObstetric Labor, PrematureLactationSex FactorsWomen, WorkingAmino Acids, EssentialFetal Growth RetardationImmobilizationBlood Pressure