First of all you need to prepare for the cat a cozy place where she will give birth. In principle, this would be a regular cardboard box on the bottom which you can put a folded in several layers of a clean towel. If the box has a sufficient depth, in one of its walls you can cut a manhole through which the pregnant animal can easily how to get inside the box and get out of it. Let your pet get acquainted with this nest – if she doesn't like it, then there is a huge probability that to give birth she will come to your bed. If everything is in order, then put that box in a quiet place where the cat won't be disturbed.
Approximately one day before birth, the cat begins to worry and hard to prepare their nest, and a couple of hours before the momentous event she calls the owner to the place where the childbirth actually will happen. Be sure to sit with the animal, stroke it and talk to him. This certainly will affect the cat soothingly, and then she will settle down and wait for the beginning of fights.
When labor begins, the cat has a fever, and her nose and ears become very hot. Watch how the kittens: normally, they should be born front feet forward. Each of them, the mother cat needs to lick, to bite off the umbilical cord and eat out the kitty last. To predict the duration of delivery in advance is impossible. Between birth of first and last kittens can pass as 40-50 minutes and hours. The owner should only talk to the cat and from time to time glances that process went fine and there were no complications.
If something went wrong, be sure to contact a veterinarian. Currently the vet you can call home, often at night. It is possible that in fact everything is fine, but to determine it can only a vet, not even being present when the cat gives birth. You can just describe what's happening on the phone. In any case, ask for permission from observing your cat to a veterinarian to contact him in case of need.