I can't speak for Ideal Protein, but being in ketosis while pregnant is NOT bad. Even if you ask a doctor, many are not up to speed about ketogenic nutrition and its benefits as whole. I know this is an old thread, and I'm certainly not an expert but I urge everyone to do their own research and not take a doctors word just because.......

http://mariamindbodyhealth.com/keto-pregnancy/

No, you should not be in ketosis while pregnant. While internet advice is questionable, I'm an ob/gyn nurse triaging and caring for pregnant patients in my career for years. Discuss your past issues with GDM with your physician and perhaps they can make an earlier referral for diet education to get started on a nutritious plan for both you and your baby to maintain a healthy lower level weight gain.