Evaluation of the efficacy of self monitoring blood glucose for gestational diabetes mellitus with onediagnostic reference point abnormality in new

INTERVENTION: Continuous glucose monitoring Continuous glucose monitoring Self monitoring blood glucose Continuous glucose monitoring CONDITION: gestational diabetes mellitus PRIMARY OUTCOME: body weight; HbA1c ; glycoalbumin plasma glucose ; Insrinogenic index; Continuous glucose monitoring; neonatal complications ; pregnancy complications INCLUSION CRITERIA: 1)pregnant women with nomal glucose tolerance 2)gestational diabetes mellitus with one point abnomality on 75gOGTT in second pregnancy trimeter 3)gestational diabetes mellitus with two or three point abnomality in second pregnancy trimeter