Previously it was as soon as I got a positive pregnancy test, but then I did that twice and miscarried the next day, so I've become a bit paranoid about it. This time I didn't go and see the gp until I'd had a scan at 8 weeks to confirm the pregnancy was viable. Call me over cautious but I've had to cancel too many 12 week scans to go any earlier now.
At our doctors we don't actually get to see a doctor - we have to tell the receptionists and they then have us fill in a form and they pass it onto the midwife team who then contact us at about ten weeks to arrange a booking in appointment.
It depends on your area laura, I needed to go to the gp to be referred for antenatal care, I couldnt' get a booking in appt without a gp visit. I also got a mat exemption form for free prescriptions. We're told to have our booking in appts between 8 and 10 weeks. I think it's different from area to area. I guess if you haven't got any worries there's no harm in waiting until you're about 7 or 8 weeks. We're fortunate enough to not have to pay for early scans here, we have a walk in, self referral EPU, so that was my first stop this time.