Pregnancy yoga that is more than just physical exercise?

any recommendations of books/websites on pregnancy and yoga that deal with preparing spiritually as well as physically for the experience?
Update: Bountiful, Beautiful, Blissful by Khalsa, Gurmukh Kaur Prenatal Yoga and Natural Birth by Baker, Jeannine Parvati Spiritual Midwifery by Ina May in the end i read all the reviews on amazon and bought the above. if i had to only get one it would be 'spiritual midwifery' but then again they... show more Bountiful, Beautiful, Blissful
by Khalsa, Gurmukh Kaur

Prenatal Yoga and Natural Birth
by Baker, Jeannine Parvati

Spiritual Midwifery
by Ina May

in the end i read all the reviews on amazon and bought the above. if i had to only get one it would be 'spiritual midwifery' but then again they haven't even arrived yet!
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