Well, it depends on how you did eat. If you ate mcdonalds every single day, then no. It's best to only increase your calorie intake by three hundred a day, and to keep from getting dehydrated. Drink at least 4 glasses of milk a day, and avoid caffeine. Avoid sugary foods and eat lots of fruits and veggies. Its ok to have a craving, but to only have that craving every once in a while. I don't know whether a miscarraige could happen because of poor food intake, but it's best to eat healthy for both you and your baby. :]