When do u start getting the nice round hard baby bumps?

19 weeks and just feel fat. I'm a size 10 in UK clothing so not exactly overweight but not really tiny tiny either but My baby "bump" isn't growing out into a nice round shape. It's kinda really low down and dents in the middle😂 it's also still soft sometimes but other times it's hard as a rock. I know it's different for everyone but did anyone have this and then one day just pop?