As Dragon Cookie said you shouldn't need to see your GP before your appointment with the MW unless you're worried about something in particular. Most appoinments are about 4-6 weeks apart depending on your circumstances.

It would be good to be given some reading info from the Dr at the start to say when you should do what just so you're not feeling in the dark. I think everyone feels like that with their first and I still feel a little like that with #2, I forget so much in just 2 years!

Good luck with it all. Enjoy the pregnancy ride!