Step 1: Take notice of the amazing power of her body
Step 2: Water and vitamins
Vitamins. Likely, she will take some kind of supplemental vitamin while pregnant. If you can make sure that she takes her vitamins every day with maybe even just an email or text message, she will feel like she is part of a well-oiled pregnancy team.
Step 3: Reading Material
If it were my choice, my man would've read The Continuum Concept. In fact, I wish everyone in the whole world would read it.
Step 4: Offer to go with her
Step 5: Help her to prepare
Nesting: If she wants to rearrange everything, you have to help her, or hire someone to help her. She's pregnant and by the time the nesting urge hits and she has to fold and re-organize every thing in every cabinet, she will be quite large and could benefit from an extra pair of hands.
Birth Plan: Talk to her about her ideal birth, whether hospital, at home, birth center, in the lake, whatever. Find out what her fears are and try to address them. As she gets closer to the due window, make sure that all the supplies for birth are in order.
Step 6: Be Patient
Make sure you give her a big chocolate bar the day after the delivery. She will need the calories and it will make her the happiest she's been since the baby came out.
Step 7: Bonus Material
Food: She is hungry and she has to pee. But the hunger part, you can help out with. Near the end, especially, she will be heavy and her feet will tire of standing, but she will be at her hungriest part of the pregnancy. If you can make a good meal for her every day, you will be doing her a great favor. You will keep her from eating a whole box of golden grahams for dinner instead of making something for herself. Lean protein and veggies and complex carbohydrates! Not too much salt! If she needs it, she'll add it. She needs Iron and Calcium, especially, so make her something with Kale or Collard Greens or something. A good solid kidney bean never hurt a pregnant lady, either.
Feet: Even if your lady is at 35 weeks and buzzing around the world like she's not pregnant, her feet hurt. And even if she says they don't hurt, a foot rub will be well received and will help you bond with her new body and give you some quality time together that you might not get for months or even years following the birth.
Birth: Near the end, she will know that the baby has to come out soon. Maybe she will have already passed the 'due date'. The tension and anticipation of the baby's arrival and the mystery of the labor process is no good for her. Ease that tension as much as you can through talking to her about the baby and birth. And the most important part: get intimate. If you're having a hospital birth, you might not be able to make-out and get really into it at the hospital, so help her with her hormones at home, whenever you get a chance. Show her that you love her body! The hormones that put the baby in there will get the baby out.