Enjoy it, enjoy it, enjoy it!
Pregnancy flies by far too quickly & it will be gone before you know it. How about keeping a personal diary with your thoughts and feelings to show baby when he/she is older? Maybe you could focus some of your energy that way. Either in a book or a video diary.
My 1st pregnancy was so enjoyable and it went in the blink of an eye. I wish I had kept some record of my excitement. That's not to say that I'm not excited this time, but with all the will in the world, I just don't have the energy or time to focus on #2 in the same way.