you will know she will go into a calm quiet place and not move till she has had her kittens but keep your eye on her cause i had tohelp my cat to deliver her kittens it was a great experience one not to be missed
when my cat had kittens roughly a week b4 if i placed my hand very gently on her tummy when she was laid on her side i could feel faint kicking.usually when a cat is due 2 give birth the nipples/teats will swell significantly and she will wander from room 2 room acting as if she cant get comfortable.when she looks very swollen and ready 2 pop try keeping her in so that if she has the kittens they will be safely indoors.failing this ur vert can give u a rough idea.hope this helps
well it all depends on when she was mated? - reading between the lines I dont think you know - I would suggest you do some reading up in preparation http://www.vets.org.nz/CareerPet/PetCare/VetsV iew penultimate paragraph!!)