20 weeks but you can't tell :(

I'm 20w1d and I don't look pregnant, just chubby. Not only does it make me feel insecure when I go out ( I used to have anorexia so I hate how I look right now) but I've been so excited since I got my bfp to have a cute round belly, I want to have a real baby bump. It's so depressing seeing people at 16 - 19 posting pics of their bumps and looking obviously pregnant. Nobody ever knows I'm pregnant and I hate it. I'm also only feeling slight movements thus far. The only thing that makes me feel preggers is being sick. When do you guys think I'll "pop"?? My stomach was basically flat pre-pregnancy so this is all baby. Anyone else look like this at 20 weeks?