Variations in diet largely depend on your health condition and physical anatomy. Everyone resorts to food differently and it depends on their thirst and disliking for certain foods. All is well when you have to feed ONLY for yourself.
However, the food you eat is of increased importance, especially when you are pregnant and nourishing another life inside you.
During pregnancy, always eat healthy and nutritious. Junk food would only fulfill your cravings and would add little to you or to your baby development.
Certain foods are known to be highly beneficial during this time if you are away from any allergies and if taken in moderation.
Check this wonderful infographic from Superfoods Living which illustrates some of them. Talk to your doctor or medical expert to include them in your diet.