Bed RestPregnancyHead-Down TiltWeightlessness SimulationPregnancy OutcomePregnancy ComplicationsWeightlessness CountermeasuresRestPregnancy, AnimalCardiovascular DeconditioningPregnancy, EctopicPregnancy Trimester, FirstSpace FlightBedsWeightlessnessPregnancy Trimester, ThirdPregnancy RatePregnancy Complications, CardiovascularPregnancy Trimester, SecondPregnancy TrimestersPregnancy TestsPregnancy, MultipleOrthostatic IntolerancePregnancy in DiabeticsPregnancy, TubalPregnancy Complications, NeoplasticPregnancy in AdolescenceLower Body Negative PressurePregnancy Complications, InfectiousPregnancy ProteinsGestational AgeAbortion, SpontaneousPregnancy, UnplannedPregnancy, High-RiskPregnancy, UnwantedPre-EclampsiaPregnancy Complications, HematologicInfant, NewbornTime FactorsBed OccupancyFetal DeathPlacentaUltrasonography, PrenatalPregnancy, ProlongedPregnancy, TwinPregnancy-Associated Plasma Protein-AChorionic Gonadotropin, beta Subunit, HumanPlasma VolumeUterusSupine PositionMuscular AtrophyExerciseMuscle, SkeletalAbortion, InducedEarly AmbulationPregnancy Complications, ParasiticPregnancy, AbdominalPrenatal DiagnosisPregnancy MaintenanceFertilization in VitroHypotension, OrthostaticEmbryo ImplantationPrenatal CareEmbryo TransferFetal DiseasesMaternal AgeDown SyndromeMaternal-Fetal ExchangeHypovolemiaParityNuchal Translucency MeasurementVascular CapacitanceUterine Cervical IncompetenceMiocamycinPrenatal Exposure Delayed EffectsProspective StudiesFetal Growth RetardationAbortion, ThreatenedBirth WeightAmino Acids, EssentialBacteriophage muImmobilizationAbortion, Therapeutic