I started working out about ten months ago, in that time I lost about 15 pounds. My breast got smaller as well.. Now the other day I noticed that they got bigger... practically to the size they were before I started losing weight.. I haven't gained any other weight since then, It seems like it was all in one night.. it happened suddenly. I started drinking a thermo drink.. I was wondering if that had anything to do with it cause it seemed after I started that is when the growth began. I doubt I'm pregnant since I'm on the pill and my test was negative. I was wondering do you have any ideas. Has this happened to anyone else???