Being overweight can lower your chances of conceiving. A normal BMI ranges between 18.5 to 24.9. Anything over 25 is considered to be overweight, and a BMI over 30 is defined as obese.
Experts believe that the extra pounds increase estrogen levels, which may prevent you from ovulating regularly or at all. Shedding just 5 percent to 10 percent of your weight can reduce that risk.