I've been meaning for some time to add a list of the books that I've been reading about pregnancy, but it's probably extensive. I've added it to the sidebar; you can judge for yourself. I think those are all the books; I hope the links work.
The secret decoder ring to the list is that if I thought the book was worthwhile, I found the link to it at Amazon. If I found it just okay but not compelling or outright gross (like that horrible What to Expect drivel or my most recent irritant, The Expectant Father), I didn't bother.