My boobs stopped growing in I think 9th grade (14 or 15 years old), I am a D cup and have a thin figure. Sometimes boobs "grow" if you've put on weight, sometimes gaining weight is healthy and natural once you get older, so don't go trying to starve yourselves back to being A cups, we can't all be twigs forever.

Since I don't know your age or development (remember TOS: if you're under 18 you can't post your age), they might just be bigger due to puberty, but if you've put on some weight and that caused them to look bigger, adding in some healthy amounts of exercise might get you back in shape and any fat near the boobs should burn off and you'd return to your smaller size. It sucks that they grew, but at least Bs are still fairly easy to bind.