You should do exercise when you get time. You should do so much exercise  that you don't get tired. Is it your first pregnancy? At 28 weeks many babies will present as breech. Most of them will become straight subsequently. Best exercise is walking and sit ups. Your normal delivery will depend on so many factors. Please don't blame yourself if you don't have normal delivery.

U can start all exercises n Yoga

Walking is the best exercise Walk 45 min 5 days a week that will help

Walking duck walk