terambulan, they don't do internal examinations routinely during pregnancy. Or at least they didn't with me, so now I'm wondering if I missed out!!
I can see your GPs point, as not many women would even know at 5 weeks. However, depending where you are, it can take a few weeks to be seen by a midwife for an initial appointment, so he should probably have referred you anyway.
When I found out I was expecting I contacted my health centre to find out who I needed to see, so they made an appt with the nurse for a week later. I went to see the nurse, who told me if I'd done a test she didn't need to do one, and to make appt with M/W myself, so I did. Never saw a GP once, so if I were you I'd just call the health centre and make an initial appt with your M/W!!
Good luck!!