Okay so this feels like a weird question but I have no idea what to expect or view as normal as this is my first. I had my son 3.5 weeks ago. So I was barely a b cup

pre-pregnancy and am now a dd. I feal like I'm ruined. :( I'm covered in stretch marks and my boobs sag. I'm breastfeeding on demand and pumping between feeding (need to build up a freezer stash before I return to work next month).... when I wheen my son will my boobs go back to how they used to be or will they remain this big and saggy?. I mean I'm fine with them being bigger but I feel like an old lady and I'm only 20 D":