MethotrexatePregnancyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPolyglutamic AcidPregnancy Trimester, FirstAntirheumatic AgentsPregnancy RatePregnancy Trimester, ThirdPregnancy, TubalPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsFolic Acid AntagonistsPregnancy, MultiplePregnancy in DiabeticsPregnancy Trimester, SecondTetrahydrofolate DehydrogenasePregnancy Complications, NeoplasticPregnancy in AdolescencePregnancy Complications, InfectiousArthritis, RheumatoidAbortifacient Agents, NonsteroidalAbortion, SpontaneousAminopterinAntimetabolites, AntineoplasticPregnancy ProteinsPregnancy, UnplannedPregnancy, High-RiskLeukemia L1210Reduced Folate Carrier ProteinPregnancy, UnwantedFolic AcidGestational AgeTrimetrexatePregnancy Complications, HematologicInfant, NewbornDrug Therapy, CombinationPlacentaPregnancy, ProlongedPre-EclampsiaTreatment OutcomePregnancy, Twingamma-Glutamyl HydrolaseAbortion, InducedLeucovorinPregnancy, AbdominalTetrahydrofolatesFetal DeathDrug ResistanceCyclophosphamideUterusUltrasonography, PrenatalImmunosuppressive AgentsPregnancy Complications, ParasiticPregnancy MaintenanceAntineoplastic Combined Chemotherapy ProtocolsDrug Administration ScheduleSulfasalazineEmbryo ImplantationEmbryo TransferPrenatal CarePrecursor Cell Lymphoblastic Leukemia-LymphomaFertilization in VitroVincristineDeoxyuridineProspective Studies6-MercaptopurineMaternal-Fetal ExchangeDermatologic AgentsTime FactorsParityPrenatal Exposure Delayed EffectsBirth WeightChorionic GonadotropinCesarean SectionFluorouracilFormyltetrahydrofolatesRetrospective StudiesDose-Response Relationship, DrugPregnancy Reduction, MultifetalFolate Receptors, GPI-AnchoredMaternal AgeHypertension, Pregnancy-InducedAbortion, TherapeuticFetal Growth RetardationProgesteroneHydroxychloroquinePremature BirthDoxorubicinInfertility, FemaleChorionic Gonadotropin, beta Subunit, HumanPhosphoribosylaminoimidazolecarboxamide FormyltransferasePrednisoneAbnormalities, Drug-InducedLactationRisk FactorsOsteosarcoma