| Outcome Measures: |
Primary: Alive baby, it will include alive , neonatal death and still born, At birth, up to 28 days after birth|Neonatal morbidity, it will include birth weight, macrosomia,neonatal hypoglycemia,transient tachypnoea of newborn ,respiratory distress syndrome,neonatal intensive care admissions, prematurity,sepsis,neonatal jaundice,birth trauma., at birth upto 28 days after birth | Secondary: glycemic control, fasting and random blood glucose levels , at study entry ,mean levels throughout pregnancy and at 36/37 weeks of pregnancy. HbA1 C Levels,at study entry and at 36/37 weeks of pregnancy, day1 (study entry ) till devlivery|weight gain in prenancy, total weight gain in pregnancy in kg, day 1 (study entry) till delivery|Maternal hypertensive complications, it will include pregnancy induced hypertension and preeclampsia., day 1(study entry ) till 1 week after delivery | Other: treatment acceptability and cost of drug, compliance and acceptability of treatment cost of metformin treatment compared with cost of insulin treatment, during study
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