Bed RestHospitalizationPregnancyHead-Down TiltWeightlessness SimulationPregnancy ComplicationsPregnancy OutcomeWeightlessness CountermeasuresRestPregnancy, AnimalCardiovascular DeconditioningPregnancy, EctopicSpace FlightBedsPregnancy Trimester, FirstWeightlessnessPregnancy Trimester, ThirdPregnancy RatePregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsPregnancy, MultipleOrthostatic IntolerancePregnancy in DiabeticsInfant, NewbornPregnancy, TubalPregnancy Trimester, SecondTime FactorsPregnancy Complications, NeoplasticRetrospective StudiesLength of StayPregnancy Complications, InfectiousPregnancy in AdolescenceLower Body Negative PressureRisk FactorsProspective StudiesAbortion, SpontaneousPregnancy, High-RiskPregnancy ProteinsGestational AgeTreatment OutcomePregnancy, UnplannedUnited StatesCohort StudiesPregnancy, UnwantedBed OccupancyPregnancy Complications, HematologicFollow-Up StudiesIncidencePlacentaPre-EclampsiaPregnancy, ProlongedPregnancy, TwinPatient DischargeExerciseEarly AmbulationPlasma VolumeFetal DeathSupine PositionHeart FailureMuscular AtrophyPatient ReadmissionUterusMuscle, SkeletalAbortion, InducedPregnancy Complications, ParasiticPregnancy, AbdominalPrenatal CareHospital CostsPregnancy MaintenanceHypotension, OrthostaticUltrasonography, PrenatalEmbryo ImplantationFertilization in VitroAge FactorsHealth Care CostsPatient AdmissionEmbryo TransferLogistic ModelsParityRisk AssessmentBirth WeightMaternal-Fetal ExchangeHypovolemiaImmobilizationPrenatal Exposure Delayed EffectsAmbulatory CareVascular CapacitanceUterine Cervical IncompetenceChild, HospitalizedAbortion, ThreatenedAcute DiseaseAmino Acids, EssentialSeverity of Illness IndexCesarean SectionAge DistributionMaternal AgePremature BirthInfant, Low Birth WeightDenmark