WW and pregnancy

I'm overweight and TTC. I am not overweight to the point where it's keepin from getting pregnant, but a lot more than I would like to be. I started weight watchers, but wasn't sure if anyone did it while pregnant? I heard that some doctors recommend doing the program as a nursing mom so that I can still get the calories needed for pregnancy. Thoughts? Has anyone else done weight watchers while pregnant? I'm 195 pounds right now.