Gestational SacCrown-Rump LengthPregnancy Trimester, FirstAbortion, SpontaneousUltrasonography, PrenatalYolk SacPregnancy, EctopicPregnancyExtraembryonic MembranesAbortion, MissedEndoleakAbortifacient Agents, NonsteroidalAbortion, IncompleteAortic Aneurysm, AbdominalPregnancy TestsBlood Vessel ProsthesisAortographyBlood Vessel Prosthesis ImplantationUterine HemorrhageGestational AgePregnancy, TubalImaging, Three-DimensionalProsthesis DesignPregnancy OutcomeAmniotic FluidPredictive Value of TestsPregnancy, MultipleFetal DeathChorionic Gonadotropin, beta Subunit, HumanCicatrix