Already told you this, but ... Congrats Stu

Gonna start that list of advice for you

For starters, stock up on choccies for your missus, if she's anything like I was LOL. Ok still am, but stopping smoking's my excuse this time
BTW good on you for stopping smoking, good timing
I feel an anecdote coming on ...
One of the other girls I worked with who was pregnant at the same time as me (there were 3 of us! apparently we'd all enjoyed Easter very much) suddenly announed she'd stopped smoking

and later announced she was expecting

I'd guessed she was, because she'd previously vowed never to give up smoking 'cos she loved it so much. Hmmm must ask Fiona if she's pregnant LOL. (Before anyone starts wondering, no I'm not!)
Anyway, jokes aside, you'll get good guidance from antenatal classes as well Stu, so be sure to go along with your missus
PS I'm not joking about the choccies tho', I was on average of 4-5 Crunchie/Mars/Whatever per day