There was a discussion on the Primal Parent site about this, and quite a few people felt that Nina Planck's perspective was TOO lax - "do what you can but everybody cuts corners so don't sweat it". I guess it depends on how committed you are to your diet as to how swayed you might be by that kind of advice while faced with any first trimester food problems.
Food Renegade offers a Beautiful Babies course that covers preconception through breastfeeding. She's WAPF (and LLL) but paleo-friendly, and also refers to the Bradley Method.
I love Deep Nutrition by Cate Shannahan, though it's not specifically for pregnancy, or paleo. Also check out Your Amazing Newborn. For a solid academic perspective, try Ancient Bodies, Modern Lives.
Being 18 weeks along with my second, I was just browsing What to Expect the other day. I remember finding it alarmist the last time (Ina May Gaskin is a great antidote to that) but this time I just found it totally irrelevant. Many paleo people report less sickness, fewer or no aversions or cravings, minimal stretch marks or varicose veins, GD and eclampsia are obviously very rare, and certainly a distaste for medical interventions that tend to cascade into "events". There's not much left to the book except the baby's growth rate.
Chris Kresser just did a guest post on MDA about foods for fertility. Print that and the WAPF pregnancy diet guidlines out, and then rest assured that when you're well nourished the gestational gig is a non-event compared to how TV, movies and What to Expect portray.
Here's the thing: you can prepare your body, mind and home for a baby, but you can't actually prepare for pregnancy. No book will serve you as well as a good midwife. In fact, and I say this as an inveterate researcher and reproductive health professional, there is a risk that intellectualising this truly biological process is counterproductive. At the risk of sounding hippy-dippy woo-woo, you most need to get in touch with your body and learn how to meet its needs (and they may change on a dime!) and then get comfortable with being a mammal. We as individuals are not in control of this process; millions of years of evolution are and they all had to work for you to be here. Our hardest task is to support it without trying to control it. We can't and then we fear. Fear is your biggest enemy.