My experinece was that I came off of all the medications that I was on when I first found out that I was pregnant. I was on four different medications due to severe depression that landed me in the hospital a few months prior. The first four months of my pregnancy were hell for both me and my husband. I was depressed, scared, lonely, anxious. At 20 weeks, I agreed to start taking Zoloft and I am very glad that I did. My baby was born last summer and he is a healthy and happy baby. And I also believe that he benefited from his mother not crying and screaming all the time, both when he was inside of me and since he's been born.
This is an individual decision, of course, and you should make it with the help of your doctor, and your family. There is a lot of information on the web, but I found that if you look enough, you'd find information to sugget and support any view. I had to realize that throughout this child's life, I will make decisions that will effect him, and sometimes harm him. I just have to do what I believe is the least harmful. I don't regret the decision that I made.