This is my second, so I should know. Last time, in a fit of excitement and disbelief, I went to the GP as soon as knew. I had the impression that I'd been a bit quick off the mark, although she was very nice about it.
When should I go? I presume I have to get into the system at some point. I'm only 5 weeks, and stil don't really believe I am pg (no symptoms other than tiredness this time).