Hi, Pauzzi-
Congrats on your recent marriage and planned adventure into momhood. I would not let your mom's (very rude and cruel) words discourage you from getting pregnant soon.
If you feel ready to become pregnant and it's a good time (ex- you and yours have been together a while so you have financial and emotional stability), spend the next few months-to-year getting your body healthy. That means getting into good habits--like getting good sleep schedule, learning to eat breakfast, taking vitamins, working on reducing any stress issues, and finding ways to exercise that you enjoy. You can also use this time to work on your weight if you feel uncomfortable about it. Be careful about not losing a lot at once, though (1.5 pounds a week), as you will be more likely to gain it back.
While I agree it is VERY easy to gain weight during pregnancy, it appears there are ways now to combat it. There is a lot of new literature that discusses ways to reduce/avoid the baby weight. This includes literature on nutrition, recipes, and exercises.
There appears to be a lot of myths cause baby fat. For instance, during the first trimester, most moms don't need to be eating more calories than they normally consume (the baby is microscopic). It's more important that you take the prenatal vitamins. I also remember reading that you don't need to double your calories as the little one you are supporting is not the size of a full grown human being.

Also, it's okay to exercise while you are pregnant as long as it's not more heavy than you normally exercise. Sometimes there even are exercise classes offered through rec centers/colleges for moms-to-be.
Neat info on pregnancy and nutrition: