When I was pregnant this year and working, my go to blog was sewpetitegal's. She had broken down what to wear the year before when she was pregnant and it helped me so much because she addressed each trimester.
My favorite pages were the Peggy chronicles. And volume 4 was a great synopsis:Http://sewpetitegal.blogspot.com/2011/0 ... g-for.html
More recent was http://www.laviepetite.blogspot.com
. She was stylishly pregnant through this summer and I saw a lot of great ideas in both their blogs if you search back.