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PregnancyPregnancy, AnimalPregnancy Trimester, FirstPregnancy ComplicationsPregnancy OutcomeAbortion, SpontaneousPregnancy, EctopicPregnancy TestsPregnancy ProteinsUterusEmbryo ImplantationEndometriumDeciduaPregnancy Trimester, ThirdPregnancy Trimester, SecondGestational AgePregnancy TrimestersPregnancy RatePregnancy Complications, CardiovascularAbortifacient Agents, NonsteroidalProgesteronePregnancy, MultiplePregnancy in DiabeticsPregnancy, TubalPlacentaPregnancy Complications, NeoplasticPregnancy Complications, InfectiousUltrasonography, PrenatalAbortion, ThreatenedMisoprostolAbortion, InducedEstrusChorionic GonadotropinCorpus LuteumPregnancy in AdolescenceVacuum CurettageFetal DeathTrophoblastsPre-EclampsiaAbortion, HabitualEstrous CycleInfant, NewbornPregnancy Tests, ImmunologicPregnancy, High-RiskMenstrual CycleSuppressor Factors, ImmunologicChaperonin 10Abortion, MissedProspective StudiesAbortifacient AgentsAbortion, TherapeuticUterine HemorrhageMaternal-Fetal ExchangePregnancy MaintenancePregnancy Complications, HematologicPregnancy, UnplannedPseudopregnancyFetal DevelopmentPlacentationAbortion, IncompletePregnancy, UnwantedEmbryo LossFertilization in VitroEmbryo TransferTime FactorsChorionic VilliPrenatal Exposure Delayed EffectsCrown-Rump LengthPrenatal CareAbnormalities, Drug-InducedHypertension, Pregnancy-InducedMaternal AgeGestational SacFetal Growth RetardationPremature BirthAdministration, IntravaginalParityMyometriumRisk FactorsCorpus Luteum MaintenanceEstradiolBirth WeightCongenital AbnormalitiesPregnancy Complications, ParasiticInfertility, FemalePregnancy, ProlongedPregnancy, TwinChorionic Gonadotropin, beta Subunit, HumanMaternal ExposureSheepQuestionnairesFetusCohort StudiesFallopian TubesAbortifacient Agents, SteroidalDilatation and CurettageDiabetes, GestationalLuteal PhasePreconception CarePrenatal Nutritional Physiological Phenomena