Nutrition and weight gain

I’m 16 weeks pregnant with di/di twins. I have gained 1lb since before I became pregnant. My appetite is very poor. When I am hungry, I eat but I get full incredible fast. I have been trying to drink protein shakes every day and nutrient rich foods but I’m really struggling. I don’t have nausea or vomiting, I just get so full I can’t eat anymore.

I have an appointment tomorrow and I’m going to ask about possibly seeing a nutritionist to help me gain weight.

I’m curious if this is normal/common or if I really should have more weight by now. I hear via chat boards that a lot of women hear “24lbs by 24weeks” for twins. I have no idea how I’ll gain 24 lbs in the next 8 weeks 🥴