I also really like the Perfect Pregnancy workout. As the pp mentioned, there's no ball - she just uses a chair. You could do the ab and pelvic section with a ball though instead of on the floor with pillows. It's about 40 minutes including the warm up and cool down. I've been doing it about 2-3 times a week since my 8th week. I'm still doing the beginner level all the way through, as I find that's the perfect level for me to get enough of a workout without overdoing it, but there are options for intermediate and advanced for several of the exercises (several using a step stool).
It's a mix of leg lifts, squats, lunges, etc. and then floor work.
The only things I don't like about it are that she transitions from one move to the other rather quickly at times (because she narrated it after filming, rather than during, I think) and I wish the cool down were longer, but I just add my own stretches at the end.
S, wife to M, missing my angel baby (May 2009) and just welcomed our son, D, 7 lbs 2 oz, 20.5".