This is the perfect time to revisit your everyday food choices! You should eat foods that will nourish the life growing inside of you, as well as your own! Eat lots of fruits, veggies, whole grains, protein, and some dairy each day. Nausea might make this difficult in the beginning of your pregnancy, so be sure to take your prenatal vitamins every day.
Certain foods can be harmful to your lowered immune system during pregnancy. These foods include large fish (mercury hazard), runny egg yolks, soft cheeses, unpasteurized milk/milk products, and undercooked meats and fish.
Check outacog.org’s comprehensive list on nutrition during pregnancy.