Pregnancy TrimestersPregnancy Trimester, FirstPregnancy Trimester, ThirdPregnancyPregnancy Trimester, SecondAbortion, SpontaneousAbortion, HabitualPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalAbortion, ThreatenedPregnancy, EctopicAbortion, IncompletePregnancy RateGestational AgePregnancy Complications, CardiovascularUltrasonography, PrenatalAbortion, MissedPregnancy Complications, InfectiousPregnancy, MultiplePregnancy Complications, NeoplasticAbortion, InducedPlacentaPregnancy in DiabeticsFetal DeathDilatation and CurettagePregnancy, TubalPregnancy TestsInfant, NewbornMaternal AgePregnancy, High-RiskChorionic VilliPre-EclampsiaTrophoblastsPregnancy ProteinsCrown-Rump LengthDeciduaPregnancy Complications, HematologicAbortifacient Agents, NonsteroidalLive BirthPregnancy in AdolescencePrenatal DiagnosisGestational SacPrenatal CareUterusFertilization in VitroInfertility, FemaleFetal DiseasesEmbryo ImplantationAbnormalities, Drug-InducedUterine HemorrhageMaternal-Fetal ExchangeHistocompatibility, Maternal-FetalParityMisoprostolCongenital AbnormalitiesAbortion, TherapeuticPremature BirthFetal Growth RetardationStillbirthEmbryo TransferFetusProspective StudiesPregnancy, UnplannedBirth WeightPregnancy, UnwantedPlacentationChorionic Gonadotropin, beta Subunit, HumanPregnancy Complications, ParasiticObstetric Labor, PrematureFetal DevelopmentPregnancy, TwinPrenatal Exposure Delayed EffectsEndometriumChorionic GonadotropinRisk FactorsMaternal ExposureChorionic Villi SamplingPregnancy Reduction, MultifetalCesarean SectionReproductive Techniques, AssistedAmniotic FluidAmniocentesisPlacenta DiseasesHydatidiform MoleHypertension, Pregnancy-InducedRetrospective StudiesSperm Injections, IntracytoplasmicDown SyndromePregnancy, ProlongedCohort StudiesCase-Control StudiesKaryotypingPregnancy MaintenancePregnancy, AbdominalAborted FetusBirth RateInfertilityInfant, Low Birth WeightAntibodies, Antiphospholipid