Thanks to Katherine Cruise for sending me the link to this article in USA Today a few days ago about depression during pregnancy: http://www.usatoday.com/news/health/2006-03-12-depression-pregnancy_x.htm
In terms of taking meds during pregnancy, I can only share my own experience. As you know, I was on Cymbalta during pregnancy. My daughter did not develop any heart defects or lung defects as far as I know, and she did not experience withdrawal. She seems like a perfectly healthy and happy 1-week old.
This, of course, doesn't guarantee your outcome. Each person and their situation is different. It's important to talk to your doctor.