That sounds good, Lucky! He seemed very confident in himself that he can make good changes. So much better than him squirming about the topic at all and trying to deflect you!
I would suggest you wait another few days, and then when you give him the PM book, you request that you and he specifically DISCUSS each chapter or section after he reads it. So in other words, maybe once per week or however often he completes a chapter, you two can sit and just openly discuss what you found fascinating, helpful, weird, or whatever....also ask him to jot down notes to discuss with you as he is reading so that when the time comes to discuss it, he has in front of him the points he would like to talk about.
Talking about these points doesn't mean you have to DO anything about them. The real exercise is in becoming comfortable openly talking about sexuality in general, even other people's sexuality, such as the couples in the PM book. Just being able to sit there together as lovers and as adults and discuss these issues, some of which are not your issues at all but are sexual issues, will really help you both!
He might resist this. He might tell you he just wants to do it on his own time without pressure. This will be his insecurities talking, so don't listen. Just gently insist that you yourself need to talk about these things for your own personal growth, and that you need to talk to HIM about these things, not friends or family...again reminding him that it is far from unusual for a married couple to discuss sex!
So sorry he is sick and will pray you and the baby don't get it, too!