As you can imagine, I have read a few pregnancy books in the last month or so. I've learned the science behind everything (including a few things I forgot from Middle School Sex Ed Class). However, my favorite book so far is the Girlfriends Guide to Pregnancy.
It's a very light quick read that will leave you in stitches. It tells you all things your doctor won't. Anyone pregnant, thinking about getting pregnant or has already experienced it will get a few laughs out of this book.