There's a great book called "Before Your Pregnancy". I didn't answer until I saw that you aren't pregnant yet! It will help you get an idea of how to prepare your body, at least, and give you an idea of how to eat once you become pregnant.
Other than that, you just kind of follow the regular guidelines- eat plenty of fruits and veggies, whole grains, lean proteins, keep your sugar intake low, make sure you get your Omega-3s in (be careful about mercury and fish), and eat small, frequent meals to keep your blood sugar steady (it's easy to get light headed when you're pregnant). Drink plenty of water, stay away from caffeine.... Etc.
Make sure you're taking a prenatal vitamin now, too, and continue through your pregnancy and while you're nursing (if you choose to nurse).
at 9:23 PM on Oct. 7, 2010