Can't remember when I started showing with my first, second I had a little bump at 11 weeks, but I lost that one, then the next was twins and didn't get a bump until 15 weeks then it grew quickly, lol, this time I feel like I'll get a bump soonish, the MW who first saw me thought I was 13 weeks, so assuming my uterus is already stretched from the twins so thinking I'll show sooner. Who knows though. I think each pregnancy is unique but rule of thumb usually is you show sooner with your second, by I suppose it depends on how long between and if your work your abdominal muscles.