Weight gain while being sick?

Kaylah

I'm so confused and a little worried. I dont constantly weigh myself because my last pregnancy was diagnosed IUGR and everything was about gaining weight and it was so stressful. Anyways I have an appointment tomorrow and I feel like I've finally popped and look pregnant at 28 weeks but also my nausea has been getting bad the last couple weeks as well killing my appetite. Unless my scale is off, it's saying I've gained 10lbs in 3 weeks which sounds crazy to me. Is this normal especially because I know I'm not overeating or eating bad choices due to the nausea I've been having and food aversion?