Step 5: I know this can be a touchy subject, but being overweight or underweight puts you at risk for pregnancy complications. Being overweight or underweight is measured by calculating a body mass index or BMI for short. The BMI is a measure of body fat based on height and weight. Your health care provider can calculate this measurement for you or you can easily do it yourself. Check out this link to calculate your BMI:
http://www.nhlbisupport.com/bmi/