I'm not really wanting to be argumentative here, but did your doctor actually clear you for bootcamp-type exercise at 8 weeks, or did they say that it would be OK to begin physical activity at 8 weeks? Just keep in mind that even after 8 weeks, your body is still in a much different state than before you were pregnant (for example, looser joints).
Ok, my opinion aside... where were you doing the classes before you got pregnant? Are those classes not available anymore? In my area, there is an instructor that I know that teaches Mom & Baby boot camps... basically you can bring your child along in a jogging stroller and she will do outdoor fitness classes with the group. As for crossfit, if you google crossfit, you should be able to find out where they are located and in which cities. If you're not planning on going to a gym at all, you should be able to find crossfit or bootcamp type workouts online that don't require equipment.