Starving but get full so fast?

Anyone else getting starving and feel like they could eat a whole meal and then you sit down to have an average sized meal and get full after only a few bites? That’s me so far. I never experienced that with my first pregnancy. I’ve lost 10 pounds from not being able to eat much and nausea and it sucks! I’m not overweight either, I weighed myself yesterday and I was 119.4 lbs so I really can’t be losing weight but not sure what else to do when I get full so fast.