What can I do to lose weight during pregnancy? But also gain weight or I guess in general stay healthy & fit with out hurting the baby?

Weight gain in preg. You should never try to lose weight in pregnancy. If you start out at a normal weight, you should gain 25-30 lbs. if you are underweight, you should aim for 30-33 lbs. Overweight women should still see a positive weight gain of 20-22 lbs.
Do you want to lose. or gain weight? Do not recommend that you select pregnancy as the time you try to lose weight ! If you are pregnant - your physician can provide education. Because you are a teenager, you may be provided additional resources to help you.