Part of a safe exercise program is knowing your limits. You need to pay attention to your body's signals and stop when your body is telling you to stop. It's not good for you or your baby to exercise to the point of exhaustion, breathlessness, or overheating. Warning signs that tell you to stop exercising and/or call your doctor include the following:

• Vaginal bleeding or amniotic fluid leakage

• Preterm labor or decreased fetal movement

• Dizziness or fainting, muscle weakness, or difficult or labored breathing prior to exertion

• Increased swelling in hands, feet, and/or ankles

• Headache, chest pain, calf pain or swelling

• Vomiting, nausea, or abdominal pain