The vast majority of American women have an uncomplicated pregnancy. While it's natural to worry about things like miscarriage, preterm birth, and genetic defects, dwelling on every possible thing that could go wrong with your pregnancy can be daunting and self-defeating. This section of The Everything Pregnancy Book, 3rd Edition is provided as an educational reference. The chances that you will need it are slim, but if you do have problems in pregnancy, staying educated and informed can reduce related stress and help you take the best care of both baby and your body.