Weight gain with GD

Brittany
Hello all!! Just a quick question!! I've recently been diagnosed with gestational diabetes. And when I went to my dietician she seemed confused on my weight gain. I lost 14 lbs in my 1st trimester. I've only gained 3 back and it's been incredibly slow!!! I've been the same weight since I was 20 weeks. I am currently 27 weeks. My doctor hasn't said anything about my weight gain. My baby is measuring where he should according to fundal height. But the dietician was saying most patients with GD gain a lot. I was a little overweight to begin with although not much. My belly, baby, and breasts are growing (went from a size F to J and still going) but my legs, arms, and face keep getting smaller. Advice?