The best thing my sister gave me for my first is the "What to Expect When You Are Expecting Pregnancy Planner and Journal". It is an organizer that gives you places to note the results of tests, notes about each doctor's appointment, lists of things to remember to ask at the next appointment, birthing plan, notes for seeking a pedicatrician, a hospital, a doula (if so desired). It also has a tracker for items that she would need for her suitcase, and a place to keep track of everything she needs for the baby. It also has a place to record exercise and a place to track what you eat. My doctor didn't like the diet they recommended, but you can still track what you eat, even if you choose not to follow that diet. I felt a little scatterbrained at first, trying to remember everything. With this book, everything was written down in one place, which help me a lot. I liked it so much, I bought another one for my second child.
The "What to Expect When you are Expecting", "What to Expect the First Year" and "What to Expect The Toddler Years" are all helpful. But, if she was like me, I wanted a more detailed account of what was happening to me. So I would recommend a week by week book vs the Expecting book, which is month by month. However it does answer a lot of questions, even the ones you might find too embarassing to ask.