I agree with you tony exercise and positive stress is a good thing for a pregnant gyp. You dont want her to get too fat anyway.
You need to get you a horse, start her on cows, and do some day work. Would be good for the gyp but not too hard on her. Throwing calves is a good practical exercise for you as well in your cross fit routine. You can just send me a check for consultation fees, its not all that pricey given I specialize in both fitness for expecting canines, and practical workouts for humans......
Waylon