I have a pregnancy book/journal called "Bump to Birthday".
It's not huge, first few pages are about mum and dad, how they felt when they found out they were expecting, etc then it goes in to a weekly journal, a brief description of what the baby is like and progression each week, then a section for me to fill in how I've been feeling and what we've been upto, as well as a place for a photograph (I take a bump picture each week for this).
It has a page for 12/20 week scans, then goes in to the birth, visitors and gifts, a few pages for "firsts", first holiday, first Christmas and then finished on first birthday. I filled it out for my daughter and currently mid way through another for this pregnancy. It's so nice to look back on because it's surprising how quickly you forget the little things. It's good for comparison in my second pregnancy too, I can look back at how big (smaller!) my bump was and at what point I felt movements!