I read only ...

"the yummy mummy survival guide" (excellent - I found it empowering, that pregnancy is a condition, not an illness)

"what to expect when expecting" (great week-to-week stuff) and that was it for me.

Ooooh and also "pregnancy basics" which is a womans' weekly mini-book we bought @ Spotlight.
I found the information I needed either here or by asking my doctor.

However I found the best book given to me after the birth was "your childs' illnesses" which is like a bible to me.