First stop for me was calling my GP to book in with the midwife - no rush, they might see you in until about 8 weeks (although they saw me at 4). She'll ask a lot of questions and maybe take some bloods and do wee and blood pressure checks.
If you haven't already get yourself a good pregnancy multi-vitamin, or at least folic acid and start taking straight away.
Do you think you might tell anyone your good news? We told parents and I told my 2 good friends - that's the best bit.
And then settle in for the looooong wait for your 12 week scan!
Exciting times! My gp got me in for a quick appointment mainly to set up the official midwife one and advised taking folic acid. Also some (really quite random) instructions on what to eat. I recommend familiarising yourself with the sensible guidance on Nhs choices!