There is no need for cosmetic surgery, what's more, cosmetic surgery has too many sequelae, which is naturally really beautiful. And looking at your data, I think you are not fat, but a healthy weight. It's normal for a girl to have a wider pelvis, so the delivery will be smoother than a girl with a narrower pelvis. This is a good thing, so don't do it. If you want to have a better figure, you can shape it by exercising. For example, a fitness software I am using now is called FitTime, which contains many shaping courses and dietary suggestions to help you shape better.