How do I lose weight while pregnant (started out very overweight) without hurting my baby?

Not good for baby. Even women who are very overweight should not lose weight while pregnant. You will probably be advised to gain less than a woman who is not overweight. But you need to talk to your doctor to find out how much you need to gain and, even more important, how to eat right while you're pregnant and after the baby is born. It would be helpful to talk to a dietitian as well.