Pregnancy, EctopicAbortifacient Agents, NonsteroidalPregnancy ComplicationsDilatation and CurettagePregnancyUterine HemorrhageCervix UteriPregnancy OutcomeMethotrexatePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularUterusPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsInjectionsPregnancy Trimester, FirstEmbolization, TherapeuticAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationUltrasonography, Doppler, ColorAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdCivil DisordersPostoperative ComplicationsPlacenta DiseasesPregnancy Complications, InfectiousEclampsiaPregnancy, TwinObstetric Labor, PrematureInfant, NewbornPlacental CirculationGestational AgeTrophoblastsDiabetes, GestationalCongenital AbnormalitiesFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsStillbirthPrenatal CareInfant, Small for Gestational AgeAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsBirth WeightRisk FactorsPregnancy RateMaternal AgeParityAntibodies, AntiphospholipidRetrospective StudiesPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangePregnancy in DiabeticsProspective StudiesPregnancy, TubalAntiphospholipid SyndromeMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureFertilization in VitroPregnancy in AdolescenceCohort StudiesDeciduaOdds RatioThrombophiliaLogistic ModelsTreatment OutcomePregnancy, UnplannedRisk AssessmentPregnancy, UnwantedIntraoperative ComplicationsHomocysteineNorwayIncidencePregnancy Complications, ParasiticInfant, PrematurePregnancy, ProlongedAbortion, InducedUnited StatesTime FactorsCase-Control StudiesQuestionnaires