Congratulations!
There's only a year and 10 weeks between my 2 and although it was hard when they were younger it's fantastic now.
All my friends have children 3 years apart and I have to say they were a little smug when I was so shattered when my 2 were younger. Now though they are always commenting how jealous they are of me now as it's so easy to find something they both like and they really just entertain themselves together.
Hope everything goes well.