The need for supplemental vitamins during pregnancy is generally recommended. You may purchase prenatal vitamins at your local pharmacy. Make sure your vitamins contain 30-60 mg of iron and at least 800 mcg of folic acid. Vitamins may cause some stomach distress in early pregnancy. If stomach distress occurs, or if you are unable to swallow pills, you may try 2 children’s chewable vitamins a day. It is also suggested to take vitamins before bed to decrease stomach distress.