Lack of weight gain

Has anyone else not gained a single pound?? I was diagnosed with gestational diabeates at 12 weeks. I was forced to cut out all sugars, and excess carbs. I'm 19 weeks now and weigh one pound less then when I got pregnant I've put on some weight but only what I'd  lost when I started  the diabetes diet. I've read that little to no weight gain is one of the few blessings of GD but my husband is pissed.