Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.
That's just her though. If you're going to plan to be pregnant, maybe you and your pdoc should discuss decreasing the doses to see how you respond.
Here is the best article I've found on pregnancy and the effects of medication:
http://www.medscape.com/viewarticle/457163
I hope this helps =)