My absolute favourites (have been pregnant twice before).
For Birthing: Juju Sundin - Birth Skills. I used some these techniques for delivering both my children. Very practical.
For pregnancy: Up the duff by Kaz Cooke. Funny well researched. Easy to connect to. My constant companion in my first pregnancy, not so much subsequently.
For Morning Sickness: Morning Sickness Survival Guide by Lisa McAully. Came across this recently. It's a pretty short guide but definitely worth reading. Has some practical stuff in there you don't find in the usual stuff floating around. It's linked to a site that sells morning sickness survival kits which is based in aus.
Didn't really connect the What to expect series though it is very comprehensive.