Trust this two time mom when I say that once your kids are here, especially the second one or afterwards, you're not going to have a lot of time to work on scrapbooks, baby books or baby albums. I decided to do a handwritten journal for my two, figuring it would be easier. Neither of them has been written in since 2003, although I keep them on my nightstand, every night thinking, "I'll update them tomorrow."
Why not start a pregnancy scrapbook? If you're totally swamped once he or she is here, at least your baby will have mementos from this special time in your life. It doesn't have to be one of those huge projects that make you feel guilty. You can find a simple predesigned scrapbook at a craft store that only requires you to put down pictures and stickers, or you can do it the old-fashioned way and use a plain photo album, making your own tags in your word processor. Substance, in this case, is preferable to style.
Items to include in the pregnancy scrapbook include sonogram photos, cards from your baby shower, e-mails announcing you're pregnant to faraway family and friends, printouts of baby names and photos of your baby bump from month to month. Be creative! Anything that has meaning to you goes, although the actual EPT pregnancy test probably won't fit in the pages of your book.
Try to keep things roughly chronological, which you can do by putting an item in the day you decide to use it. That keeps the whole thing from getting out of hand. Buy the book and do the first page the day you get home from the sonogram appointment, adding each item as you acquire them.
Finally, finish up with a page full of predictions for your baby from your friends and family. These are delightful to read later as your child grows up. Everyone predicted my first daughter would someday be an ace left-handed pitcher for the Yankees, and I still think she might achieve that goal, except for the left-handed part!