Ok.. Well.. Where to start..

This is my first pregnancy and medically speaking I am really unsure of how things are meant to go..

My worry and questions is about my GP..

When I first took the home preg test and it came up poss I went straight to my GP who performed a urine test to confirm and also a blood test for rubella etc..
A week later I went back for the results to find I am in perfect health.. I had a few questions like where to go from here etc and was told to go back to see him in a month (which is next week) I asked about an ultrasound and he said not until 16 weeks.. which just sounds wrong to me as I always thought it was at 12 weeks??
He also never told me about foods to avoid, coffee etc - but I now know due to reading.

My question is Do I need to go back to him or can I ring the hospital I want to give birth at and go from there??

I really think this deserves more attention than he is giving.. Or am I just been paranoid??