Fuel to Run

 I know it sounds silly, but I have gained weight and am at a loss as to why. I am not pregnant! My stomach looks about 8 weeks pregnant. Test is surely negative and to top that it is virtually impossible to be. I am frustrated with the weight gain! I have gained 4 pounds  and can not loose it. Due to running I did increase my food intake, I doubled my caloric intake.  I went from 1200- 1400 calories per day to 1600-1800 per day. So my question is do I live with extra weight or cut back my food? If I don't eat enough I lack the fuel to run. However, it is bugging me a bit. Even my husband and girlfriend Jenny noticed.