Loosing weight with GD

Since I was diagnosed with GD , I have been very careful on what I eat, cut down all the sugar and eat the right carbs and protein, my weight has been going down and I'm just concerned if my baby is getting enough/right weight. I have an ultrasound in two weeks. When I saw my dietician , she was a bit concerned about my weight loss.. cos she wants me to gain atlist 16 pounds 🤔 I'm six months pregnant and my appetite is not the best. Oh boy I feel overwhelmed and nervous.

But I was a little overweight before I got pregnant. I was 165 and now I'm 156.2.

Anyone with the similar experience?