http://diabetes.niddk.nih.gov/dm/pubs/pregnancy/ High blood glucose levels before and during pregnancy can worsen your long-term diabetes problems, such as eye problems, heart disease , and kidney disease increase the chance of problems for your baby, such as being born too early, weighing too much, having breathing problems or low blood glucose right after birth, or other health problems increase the risk of your baby having birth defects increase the risk of losing your baby through miscarriage, which means loss of the baby before 20 weeks, or stillbirth, which means the baby dies in the womb after 20 weeks