There is a way to palpate the doe's belly(feeling it with your hands) to determine if there are fetuses; but Iwouldn't recommend it if you aren't used to this method, and if the doeis in early stages of pregnancy, as fetuses can be injured. As forspecific behavior, from what I can recall, if a doe has been bred andis then put back in the cage with the buck 10 days or so later (couldbe wrong on the length of time) she will most likely refuse him.
Have you bred your doe on purpose, or are you simply wondering if therabbit you have is pregnant (i.e., is she a newly-aquired rabbit, orwas she accidentally put with a buck)?