Bed RestPregnancyHead-Down TiltPregnancy OutcomeWeightlessness SimulationPregnancy ComplicationsWeightlessness CountermeasuresRestPregnancy, AnimalCardiovascular DeconditioningPregnancy, EctopicSpace FlightBedsTreatment OutcomePregnancy Trimester, FirstPregnancy RateWeightlessnessPregnancy Trimester, ThirdPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultipleOutcome Assessment (Health Care)Orthostatic IntolerancePregnancy Trimester, SecondPregnancy in DiabeticsPregnancy, TubalTime FactorsPregnancy Complications, NeoplasticPregnancy in AdolescencePregnancy Complications, InfectiousLower Body Negative PressureAbortion, SpontaneousInfant, NewbornGestational AgeRetrospective StudiesPregnancy, High-RiskProspective StudiesPregnancy ProteinsPregnancy, UnplannedPregnancy, UnwantedPregnancy Complications, HematologicFollow-Up StudiesRisk FactorsPre-EclampsiaFetal DeathPlacentaPregnancy, TwinBed OccupancyPregnancy, ProlongedExercisePlasma VolumeCohort StudiesSupine PositionAbortion, InducedFertilization in VitroUltrasonography, PrenatalPrenatal CareEarly AmbulationUterusMuscular AtrophyMuscle, SkeletalPregnancy Complications, ParasiticEmbryo TransferEmbryo ImplantationPregnancy, AbdominalBirth WeightPregnancy MaintenanceHypotension, OrthostaticParityPrognosisPrenatal Exposure Delayed EffectsMaternal-Fetal ExchangeOutcome and Process Assessment (Health Care)Cesarean SectionPremature BirthHypovolemiaAbortion, ThreatenedInfant, Low Birth WeightMaternal AgeUterine Cervical IncompetenceFetal Growth RetardationVascular CapacitanceImmobilizationAmino Acids, EssentialHypertension, Pregnancy-InducedPregnancy Reduction, MultifetalSpinal PunctureInfertility, FemaleCongenital Abnormalities