Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstAbortion, SpontaneousPregnancy Complications, NeoplasticPregnancy, EctopicFetal Growth RetardationAbruptio PlacentaePremature BirthPlacentaPregnancy, AnimalPregnancy Trimester, SecondPregnancy Trimester, ThirdPregnancy Complications, InfectiousUterine ArteryPostoperative ComplicationsCivil DisordersPlacenta DiseasesObstetric Labor, PrematureInfant, NewbornEclampsiaPregnancy, TwinDiabetes, GestationalPreconception CarePlacental CirculationCongenital AbnormalitiesGestational AgeTrophoblastsPregnancy, High-RiskCesarean SectionFetal DeathPrenatal CarePregnancy, MultipleObstetric Labor ComplicationsRisk FactorsStillbirthUterusParityInfant, Small for Gestational AgeWomen's HealthUltrasonography, PrenatalBirth WeightWomenAbortion, HabitualMaternal AgePregnancy ProteinsPregnancy RateRetrospective StudiesPregnancy TrimestersDelivery, ObstetricAntibodies, AntiphospholipidPlacental InsufficiencyPregnancy TestsPlacentationMultiple Birth OffspringMaternal-Fetal ExchangeCohort StudiesPregnancy in DiabeticsMaternal WelfarePregnancy, TubalProspective StudiesReproductive Techniques, AssistedFertilization in VitroAntiphospholipid SyndromeOdds RatioFetal DevelopmentLogistic ModelsInfant, Low Birth WeightFetal Membranes, Premature RuptureTreatment OutcomePregnancy in AdolescenceRisk AssessmentDeciduaIncidenceThrombophiliaPregnant WomenQuestionnairesPregnancy, UnplannedUnited StatesCase-Control StudiesPregnancy Complications, ParasiticTime FactorsNorwayFollow-Up StudiesPregnancy, UnwantedHomocysteineIntraoperative ComplicationsAbortion, InducedInfant, PrematureConfidence IntervalsPregnancy, ProlongedBattered WomenInfertility, FemaleBiological Markers