Will swimming make my boobs smaller?

Basically, I want to start going swimming about twice a week to start losing weight.

Im not extremely skinny but I'm not fat, I've just got a little bit of a chubby belly and a bit of love handle going on. My concern is, can I start doing vigorous swimming to tone my legs bum and tum without my breasts getting smaller?

Extra info: I'm 15, my BMI is fine and I am a 36DD.

Hi,I have been doing alot of swimming and what with my breasts been an F cup they havent got any small at all babe,they will probebly get firmer but thats about it x Babe you answerd my question regarding me having a breast to breast massage to make my breasts softer,can I ask,would it be better to do it with a girl that has the same size breasts as me ? as when I watched the japeness girls doing it there breasts were about the same sizes,all I can say is that if so her breasts are going to have to be pritty hard on my breasts to do the massage,I hope you can help me abit on this xx thanks.P.S your breasts are a good size for your age and there still growing babe so I dont think you need to worrie about them getting smaller babe xx