Congratulations and best wishes to you and your baby! Many women are inspired to adopt healthy habits when they're pregnant - and it's great to make the changes permanently. Because women's joints loosen during pregnancy (in preparation for birth), doctors don't recommend starting a strength training program until after the baby is born and you've recovered. However, mild-to-moderate aerobic exercise is fine for most moms-to-be. Assuming your doctor agrees, you could start a walking if you aren't already doing aerobic exercise - Strong Women Stay Slim has instructions on working your way up to 30 minutes per day. The food plan is very flexible, and can be adapted to pregnancy (and later, to breastfeeding). Ask your doctor what calorie level is appropriate for you (probably 2000 at least). Because weight loss is not advised during pregnancy, make sure the doctor understands that this book can be used to establish healthy eating and exercise habits and that it's not just for weight loss. Once you've had the baby, you can think about beginning strength training. A good time to ask your doctor if you're ready to get started is at your post-partum checkup. It's wise to progress more slowly than the general recommendations in the book - increase the weights only every second or third week, and pay particular attention to how you feel.