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