I have been meaning to reply, but my life is rather hectic at the moment. DD has just turned one, I'm back at work and we are renovating.
On a day to day basis the thoughts of donor just don't enter my head. DD is our daughter and I'm pleased to say all the agonising of the previous 8 years is now a memory.
Of course when DD is old enough to understand and starts asking more questions things might be a little different. But I honestly don't think it will be a big deal.
Make sure you see a counsellor (which I think is mandatory anyway) and ask all the silly questions in the world.
I can't imagine life without DD, it is the best decision we ever made (even though it is one that no-one should have to make).