Lost weight since last appointment

I’m almost 32 weeks have gained 50 lbs this pregnancy. I was diagnosed with pregnancy induced hypothyroid in the first trimester (gained so much weight then) and was diagnosed with gestational diabetes a few weeks ago. I realize 50 lbs is a lot, but I lost 1.5 lbs since my last appointment (3 weeks ago). My doctor didn’t mention it at all and I forgot to ask about it since there were several other things we were going over. This is my third pregnancy and I’m almost forty. I’ve never once lost weight from one appointment to the next. Should I be concerned? I’m having a hard time getting enough calories since they diagnosed me with gd. I have to eat every two hours and I’m still always hungry. 😕 They told me I needed a minimum 2000 calories each day. Sometimes I can’t get in but about 1800 due to the foods I have to eat to control my blood sugar.