23 year old girl living in Belgium: Butt is bigger, but still flat. (Photos)

I always wanted to do a BBL and now that I finely did it I'm not sure if that was a good idée. Because my butt is a little bit bigger but it's stil flat somehow. And I want to ask is it how it go , is er a problem with my body aur did the doctor do something wrong?? But be for I let it do it I did my research and and my doctor is now to do BBL .