PregnancyPregnancy, AnimalOccult BloodPregnancy Trimester, FirstPregnancy ComplicationsPregnancy OutcomeHematologic TestsAbortion, SpontaneousPregnancy, EctopicPregnancy TestsPregnancy ProteinsUterusEmbryo ImplantationEndometriumDeciduaGuaiacPregnancy Trimester, ThirdPregnancy Trimester, SecondGestational AgeColonoscopyPregnancy TrimestersPregnancy RatePregnancy Complications, CardiovascularAbortifacient Agents, NonsteroidalProgesteronePregnancy, MultiplePregnancy in DiabeticsPregnancy, TubalMass ScreeningPlacentaPregnancy Complications, NeoplasticSigmoidoscopyPregnancy Complications, InfectiousAbortion, ThreatenedUltrasonography, PrenatalColorectal NeoplasmsMisoprostolAbortion, InducedEstrusChorionic GonadotropinCorpus LuteumPregnancy in AdolescenceVacuum CurettageFetal DeathTrophoblastsPre-EclampsiaAbortion, HabitualEstrous CycleInfant, NewbornEarly Detection of CancerPregnancy Tests, ImmunologicPregnancy, High-RiskSuppressor Factors, ImmunologicProspective StudiesChaperonin 10Menstrual CycleAbortion, MissedAbortifacient AgentsAbortion, TherapeuticSensitivity and SpecificityUterine HemorrhageMaternal-Fetal ExchangePregnancy MaintenancePregnancy Complications, HematologicPregnancy, UnplannedPseudopregnancyPlacentationFetal DevelopmentAbortion, IncompletePregnancy, UnwantedEmbryo LossFertilization in VitroEmbryo TransferChorionic VilliTime FactorsCrown-Rump LengthRisk FactorsPrenatal CarePrenatal Exposure Delayed EffectsImmunochemistryHypertension, Pregnancy-InducedAbnormalities, Drug-InducedGestational SacMaternal AgePredictive Value of TestsFetal Growth RetardationParityPremature BirthAdministration, IntravaginalMyometriumCorpus Luteum MaintenanceEnemaBirth WeightEstradiolCongenital AbnormalitiesPregnancy Complications, ParasiticBarium SulfatePregnancy, ProlongedPregnancy, TwinInfertility, Female