Congrats! Are they in two separate sacs or the same one? I always wanted twins and this was my last chance, but early scan last week showed only one. I think my mind tricked me into seeing a shadowy extra bit in the top of the large sac (my baby was in the bottom of it) - but that's just wishful thinking and I'm sure at my 8 week scan only one will be confirmed.
My brother recently had twins last year on their third go too, so now they have four kids. It has been hard for them, I won't lie, but so utterly amazing and rewarding too. Two is a lot more work, but double the love and fun too from the looks of it. Good luck!