Hiya Lommy, that's brilliant news - you must be absolutely delighted!! If you haven't found it already you should log in to the babycentre website:
http://www.babycentre.co.uk/
It gives you a weekly update of what's happening inside mum's tum (all very wondrous and exciting!) plus loads of other useful stuff.. The message board is particularly useful as whatever twinge or pain you have - someone else has been there first and can put your mind at rest.
Also, (at the risk of being rude and hijacking the thread), I'd like to finally announce that after a bit of a horrible year I now have the most adorable, 4 month old daughter, Rowan.
Just looking at her wee face makes my heart want to burst - and when she finally decides to sleep for more than 40 mins at a time I'm sure I'll love her even more!!
Anyway, congratulations once again... TWINS... WOW!!!