I started at 28 weeks, but that's when I discovered it. It turned out to be perfect timing... I took an extra week to complete the program, had my baby a week early, and still had several weeks of maintenance. Honestly, I was getting burned out on it by the end. I'm at 26 weeks right now and I think I'll start on it soon because I need the relaxation practice, but I'll probably be laid back about it and won't do it all every day.