Congrats!!!
I didn't go to the Doc's until maybe 6-8 weeks and then it was for blood tests, not confirmation. I never had BFP confirmed by Doc, they said home test was fine. But saying that, do what ever you want. The Dr will tell you what needs to be done and when, which I find helpful as I forget each time! I would however book into the hospital of your choice now. I booked in last two times before 4 weeks!!
HAve a great pregnancy! xo