Congratulations on your pregnancy & your decision for a natural birth.
Consider these books:
Harper, Gentle Birth Choices: A Guide to Making Informed Decisions About Birthing Centers, Birth Attendants, Water Birth, Home Birth, Hospital Births
Gaskin, Ina May’s Guide to Childbirth
Peterson, An Easier Childbirth: A Mother's Guide for Birthing Normally
Goer, The Thinking Woman’s Guide to a Better Birth
And although you didn't ask, (
) I have to say a word about care providers/choice of birthplace. It's great that you get along w/your OB, but it doesn't tend to matter a whole lot overall... as a doula in hospitals, what I find is that the hospitals philosophies/standard practices, are extremely hard to overcome. They will make you afraid of terrible outcomes if you don't go along with their routines. Find out the stats & routines at the hospital where that OB practices, & don't assume that you would be supported in being different. It's an institution, and I'm not saying anyone has to be evil; they just have a standard way of doing things, and in most US hospitals, that's highly interventionist. The midwifery model just comes out of a completely other mindset. Which I assume you like since you are drawn to a birth center. Do check around for midwives that practice locally, and at least interview one with your partner before you decide anything.
Remember that the OB you get along with may not be on call when you go into labor, and in any event you are managed by other nurses & hospital staff often until the very end of labor.
Just my .02 I always have to mention when someone is early in pg & is hoping to 'swim against the stream.'
Good luck & keep us posted!