Write it Down
Get a pregnancy journal! I had one with my first and I bought one for this pregnancy as well. Having a pregnancy journal is a great way to keep memories because we all know how forgetful we can (especially while pregnant). Being able to jot down important notes along the way, like when you first felt baby kick, when you felt your first baby hiccups, etc. All are amazing memories and they are great to share with your little when they are older. A pregnancy journal is also an excellent way to stay organized, as they typically include appointment reminders, baby shower guest lists and how to organize your thank your cards.
A definite must have!! The one I use is What to Expect When You're Expecting organizer and you can get it at online or in store at Chapters/Indigo.