If you are pregnant, the last thing you should be worrying about is trying to lose weight. Remember, if you cut your calories to try to lose weight, that means you're depriving your baby of the vital nutrients it needs to thrive and grow !
Before you make any changes to your nutrition, you must talk to your OB/GYN. What you eat will effect you and the health of your child. That's why you shouldn't even be thinking about dieting now. Instead, you need to concentrate on eating foods that nourish you and your baby.