Chances are a GP wont do anything other than refer you toa midwife who you will have a booking in appointment with between 8 and 12 weeks.
I didnt say leave this site, but the ivillage boards are a great source of help and info too. And joining a board where everyone is due during the same month as you also helps. Its a chance to make good friends with many women in the same siuation, as well as those expecting 2nd, 3rd or more baby. And the CLs who help on the boards are good at finding relevant info for the ladies too. You will all go through the same stages together and learn from one another