There are a couple of good books written for dads who are expecting babies. I think I picked up a copy at Burlington Coat Factory in the maternity section, of all places, so if it was that available you certainly can get one on Amazon. They will have Dad or Father in the title, and maybe phrases like Expectant Dad. I didn't think they were as in-depth as "Your Pregnancy Week by Week," but my husband would not have read anything that big anyway. They are all pretty good.
I would definitely get a copy of What to Expect When You're Expecting if you don't already have one.
If you also want something that deals with having a newborn around as well as getting pregnant, things to do for your health and your baby's, etc., I authored an ebook on parenting. If you would like a free copy, simply message me the email address you want me to send it to.