Is it safe to exercise?

Yes.  In an uncomplicated pregnancy, we recommend exercise as it makes labor easier and decreases the incidence of pre-term labor as well as cesarean section.  If an exercise causes cramping, shortness of breath, or pain, then decrease the intensity or stop exercising and discuss with your doctor.  You should be able to carry on a conversation while you exercise.  Soccer, ice hockey, skiing, horseback riding and water skiing are strongly discouraged.  Scuba diving is not safe at any time during pregnancy.