Meli, did you go over or under the muscle?
If you are very athletic it is best to go over the muscle. I was not aware of this prior to surgery and decided that I wanted to go under the muscle.
I noticed that mine started to change shape when I was lifting last year. (My typical chest workout would be 4-5 exercises, 4sets, 8-10reps, once a week.) I have not done chest in over a year, and feel that they look a lot better now than they did last year.
Some shoulder exercises do work your chest slighty. I do have female friends that went over the muscle and they do not seem to have the same problems when they lift that I do. I guess it also depends on the intensity of your chest workout. If you hit the weights really hard then you might experience more difficulties than your average female with implants that casually worksout at a lower intensity