Objectives : The aim of the study were evaluate the overweight changes and risk of gestational diabetes mellitus in pregnant women and diagnose GDM. Materials and Method: We’re studied by questionare (demographic data, history of previous during the pregnancy, ) 2 groups and 16 questions , physical examination, body measurementsand blood pressure measurements. Laboratory testing of blood glucose, defined Hba1c and glucose tolerance test done. Results: This study included 200 pregnant women. 1. Pregnant women, mean age 27.09±5.2 years old, mean duration of pregnancy 22.1±9.3 weeks, pre-pregnancy body mean weight 60.4± 11.1kg, mean weight was 70.2± 13.1kg, pre-pregnancy mean BMI 22.6±3.7kg/m2 pregnancy mean BMI of 25.8± 4.1kg/m2 increased. The mean systolic blood pressure 116.8± 22.1mm Hg and mean diastolic blood pressure 70.1± 13.4mm.Hg significantly. 2. By laboratory examination fasting plasma glucose 5.1± 1.3mmoli / l, after 2 hours OGTT test mean 6.6± 2.1mmoli / l, HbA1c mean 5.6± 1.2mmol / l. Conclution: 1. Our findings indicate that high maternal weight is associated with a substantially higher risk of Gestation diabetes mellitus. 2. The study found out that 5.5% or 11 women out of the all surveyed women had a diabetes mellitus type 2 and 8% or 16 women of them were diagnosed as they had gestation diabetes mellitus.