Rude about belly?

Hannah
So I have a sister that is 18 and I am 19, she's shorter and has always had thicker thighs and larger hips; not her fault at all, she just ended up with more of my dads genes and my moms height. Every one has a different body shape which I get. I was technically underweight at the beginning of my pregnancy but struggled to gain weight no matter what I did. She struggled to stay as thin as I was or to be the weight I was. She's stunning and does modeling, but now that I am showing she has called me fat and I'm not, still not what the doctors want me to be. But hearing family thinks I'm fat and being told I look gross now, especially in a bikini or tight shirts hurts. Her and my mom both make comments towards it and would rather me look insecure about the tiny bump that I do have in moo-moos and giant shirts. Does anyone else hear this and know you shouldn't listen but it still bothers you somewhere deep down?