UK! When should I go to the doctors?

Faye • 26 • Erin - 20|08|15 - 9lbs • Bonnie - 19|08|18
Today I got my BFP! My test said I am 1-2 weeks pregnant. 
Should I make a doctors appointment ASAP to get a confirmation or should I wait a few weeks? 
What did you do? 
I keep reading different things!