I am 43 years old and I am six weeks pregnant. I have had two miscarriages, never had a full term pregnancy and I am very overweight. What are the dangers of my trying to lose weight during this pregnancy. I have been very carefully monitoring my nutritional intake since finding out I was pregnant three weeks ago. I have been trying to walk a little more, eat more fruits and vegetables and lean meats, no caffeine, no chocolate or candy. I have really changed my eating habits, but being such a high-risk preganancy, I am extremely nervous. Please, any advise would be helpful!