Bed RestPregnancyHead-Down TiltWeightlessness SimulationPregnancy ComplicationsPregnancy OutcomeWeightlessness CountermeasuresRestPregnancy, AnimalCardiovascular DeconditioningPostoperative ComplicationsPregnancy, EctopicSpace FlightBedsPregnancy Trimester, FirstWeightlessnessPregnancy Trimester, ThirdPregnancy Complications, CardiovascularPregnancy RatePregnancy TrimestersPregnancy TestsPregnancy, MultiplePregnancy in DiabeticsOrthostatic IntolerancePregnancy Trimester, SecondPregnancy, TubalPregnancy Complications, NeoplasticTime FactorsPregnancy Complications, InfectiousTreatment OutcomePregnancy in AdolescenceLower Body Negative PressureRetrospective StudiesAbortion, SpontaneousInfant, NewbornPregnancy, High-RiskPregnancy ProteinsGestational AgePregnancy, UnplannedPregnancy, UnwantedPregnancy Complications, HematologicProspective StudiesIntraoperative ComplicationsRisk FactorsPre-EclampsiaPlacentaPregnancy, TwinPregnancy, ProlongedFetal DeathBed OccupancyFollow-Up StudiesAbortion, InducedEarly AmbulationPlasma VolumeSupine PositionExerciseUterusMuscular AtrophyMuscle, SkeletalPregnancy Complications, ParasiticPregnancy, AbdominalUltrasonography, PrenatalPrenatal CareHypotension, OrthostaticPregnancy MaintenanceEmbryo ImplantationFertilization in VitroEmbryo TransferCesarean SectionParityDiabetes ComplicationsMaternal-Fetal ExchangeHypovolemiaBirth WeightObstetric Labor ComplicationsImmobilizationAbortion, ThreatenedHypertension, Pregnancy-InducedPrenatal Exposure Delayed EffectsUterine Cervical IncompetenceSpinal PunctureVascular CapacitanceCohort StudiesFetal Growth RetardationAmino Acids, EssentialMaternal AgePregnancy Reduction, MultifetalPremature Birth