Well, symptoms are:
 
 she may become grouchy, and if you stick you hand in her cage she wont like and she might makes a grunting sound, or she may not You could try breeding her and if she doesn't care if he breeds her she probably not pregnant.
 
   after about 1 1/2 to 2 weeks you can hold her neck, put you hand under her ribcage and push a little if she is hard and you feel like marbles/balls then those are babies. 
 How old are they? She wont like him if she is pregnant.