I notice it's been a while since this post, how are things now?
The answer is: nobody knows for sure. Some people go their whole lives with no change, and other people don't. As long as your doctor is aware, and you follow his/her advice you should have no problems. But if you ever feel faint or dizzy after exercise make certain to tell your physician right away.
I had a mildly leaky valve diagnosed 12 years ago and a recent echo has shown it is no worse now, so dont worry,
Chris