I am assuming that you mean like an add on nestbox. This is fine as long as it is well insulated for harsh weather and protected from the elements.
No, a hard stomach is not a sign of pregnancy in rabbits, but it probably is a sign of illness (maybe gas, bloat, or GI Stasis -- all very serious conditions!). See the vet right away! See the related questions below for more detail. No, you can't use hamster bedding in a rabbit's nest. Bedding should be clean straw or grass hay. The mother rabbit should have a nest box that you can remove from the cage while you clean it.
Put it back in the nest, and check on the rabbits to see if all of them are still in the nest. You need to also make sure after a couple of days that the mother rabbit is still feeding and taking care of all of them. The mother rabbit might abandone her rabbits cause they now have a scent on it. Or you can let nature run it's course, that means leave it alone and return to your life.
If she is showing all the signs of pregancy, such as shedding, nest making, etc., it will be a phantom pregancy, which is a common occurence.
The Velveteen Rabbit The boy contracted polio and all his things had to be burn. I cant remember how but the rabbit is left outside and it eventually becomes a real rabbit. This was the rabbit's dream, to become real.
it begins to pull off their hair to form a nest for its bunnies. in addition, it gets defensive.
Mother rabbits are very gentle and careful when they jump in and out of the nest box they have to get in to nurse the babies, however, if someone or something frightens them they could jump on and squash their babies. A snake in the area will cause a rabbit to jump in and out erratically and they could kill all the babies unknowingly.
You can find all of the information you need in the right-hand column in: http://en.wikipedia.org/wiki/Rabbit
All rabbits can live outside, as long as they are in adequate housing. (enough space, sheltered, lots of bedding, etc)
the female will be sitting in the nest box all day and the male is out side the cage garding the eggs from outside the breeding box.
DO NOT DISTURB THE NEST! Seeing if they are all right will most certainly cause them to not be all right. If you disturb mother's nest, she may abandon her babies, stop nursing them, or worse, kill them. Wait 7-10 days minimum, when you clean the cage, just scoop out the old bedding, and put fresh bedding/food/water in. I wouldn't fiddle with the nest AT ALL. If they were born in a glass aquarium, you can safely look at the babies from underneath.
In my own case, She was parading her nest throughout the day. What I did was pet her a lot, I provided fruits to comfort her. She was fine afterward.
all it takes for a rabbit to paralyze and kill another rabbit is them jumping on it's back once the right way