You can eat what you would normally eat. A healthy balanced diet with fresh vegetables that contains enough protein, carbohydrates, fats, minerals and vitamins is best.
Avoid alcohol and smoking as excessive amounts of alcohol and regular smoking have been shown to have deleterious effects on the baby. A glass, maybe two, of wine a week is OK, but not more. If your doctor wants to prescribe you something, make sure he or she knows you are pregnant, as some medicines are not recommended during pregnancy. Some exotic foods should be avoided such as french cheeses made from unpasteurized milk.
it has been shown that taking some extra folic acid (0,5 mg a day) before and in the first week after conception reduces the chance of some birth defects.