Randomization of Early Diabetes Screening Among Obese Pregnant Women.

This will be a randomization of two groups of obese pregnant women into early screening for diabetes mellitus at the time of their first or subsequent prenatal visits before 20 weeks of gestation versus standard time of screening for diabetes at 24 - 28 weeks as it is done for all pregnant women. The perinatal outcomes between the two groups will be compared to determine whether early screening for diabetes in all obese pregnant women has a clinical merit or significant.