If you do read Spiritual Midwifery, look at it as a document from a specific time and place, with the language/attitudes that prevailed. I enjoyed it, but didn't get too invested in imagining that my contractions would be "orgasmic rushes." It was entertaining, though!
Here's my list of best books to read while pregnant
Our Babies Ourselves: how biology and culture shape the way we parent - Meredith Small. Not a “baby book” but an athropologist’s look at parenting. The book that influenced my kid-related thinking more than anything else.
A Child is Born - Lennart Nilsson. Way cool photographs of conception to birth all taken inside the body.
The Life Within - Jean Hegland. Feed your soul with this: one chapter for each month of pregnancy; beautiful and reflective with out a hint of sappiness. Savor the calm of it while you still can… (out of print but you can usually find it on Amazon or Abebooks.com for cheap).
Babycatcher: chronicles of a modern midwife - Peggy Vincent. Get psyched for birth with this highly readable and entertaining account of a Berkeley midwife’s busy practice.
The Birth Partner: everything you need to know to help a woman through childbirth - Penny Simkin. Title says it all.
The Complete Book of Pregnancy and Childbirth - Sheila Kitzinger. A good read, sensible, down-to-earth, all the information you’ll ever need. Like a talk with a wise, hip granny.
The Nursing Mother’s Companion - Kathleen Huggins. Everything you need to know.
Or for something lighter but very informative, particularly if you’ve never given breastfeeding yea or nay much consideration, you can’t do better than So That’s What They’re For by Janet Tomaso. (Make sure you get the revised, 3rd. Edition).
Operating Instructions: a journal of my son’s first year - Anne Lamott. When it’s 3am and the baby’s just woken up for the tenth time and you find yourself longing to toss it out the window, you won’t feel like the worst parent on the planet. On the contrary, having read this moving and hilarious book, you will know that you are absolutely normal.
**Nearly everyone you know will press their old copies on you, but avoid at all costs the fear-mongering, annoying, What To Expect When You’re Expecting. This book will stress you out and make you question your every move. Pregnant women don’t need that).**