Less than two weeks post op and feeling boob greed!

Hello! I am 26 years of age and have wanted larger breast as long as I can remember. I decided to join because I've had the opportunity to read other peoples stories and found them to be extremely beneficial in getting insight on what to expect myself. Over the tears, I have gained and lost weight several times. I have never had any children, however noticed a decrease on fullness from gaining and losing weight. I still have more weight to lose but would like to get my breast done first. I understand the effects pregnancy will have on them (either natural or implants). While I would eventually like to have children, I don't plan on having them for roughly 5 years from now. Even then, I'd probably wait till after two kids before getting them redone (crazy since I don't have them done yet) so I figured I'd have a good 7-8 years with the first surgery. I'm currently debating on size and shape. I am 5'1 at 115 pounds. I know everyone seems to wish they went bigger. I'm thinking a full C would be ideal, perhaps a small D? I don't want to look like I'll too over lol. As for shape, I'm not sure. Natural is always good but I also want to account for gravity. I do not want saggy boobs or rocks on my chest either. Suggestions anyway? Also I enjoy running, only 2-4 miles 4x a week and can't imagine sitting ideal for 1+ month (or the weight I'll gain, probably more than 5 pounds as that's how much I gained from eating all thanksgiving weekend).