I had OB last term and I don't feel like digging out my notebook but some of the dx I used were something like:
- risk for infection r/t a site for organism invasion (secondary to catheter, IV site, cervix checks)
- anxiety r/t actual or perceived threat of biologic integrity (the patient I used this for had a lot of anxiety over the IV, blood draws, possible tearing when she delivered)
- readiness for enhanced knowledge r/t infant care, breastfeeding, etc (used this when the patient seemed genuinely interested when I told her she could watch videos on various infant care topics on her tv, was asking questions, reading the pamphlets, etc).
that's all i can think of off the top of my head... hopefully that will get you started. Here's a link to a maternal-child care plan book I found on google books. Not all the pages are there but I was able to find some of the stuff I needed.
Maternal Newborn Nursing Care Plans - Green, Carol Green - Google Books