Cats often turn up on the doorstep wanting to be let in, and there's no way you can tell whether she's pregnant or not until she shows symptoms. For this reason it is very difficult to accurately predict a birth date for your litter of kittens. However, we do know that the average gestation period of a cat is between 63 and 65 days but the only really accurate way to use this information is to count forward from the day your cat bred. If you think your cat may be pregnant then the first thing you should do is to take her to the vets to get her checked out and then take her for regular checkups.
During her pregnancy and the subsequent nursing period of your cat you should feed her a special kitten food, both meat and biscuits. This contains all the vitamins and additives required to keep her and her kittens healthy. Once she becomes pregnant, your cat will develop even more loving and needy attributes to normal. Morning sickness and a heightened appetite will also be evident with your mother-to-be eating up to 3 times as much as normal.
Cats usually experience very few problems with labour or delivery but you should always try to be there if your cat is to be a first time mother. If this is the first time for your cat, you should follow her to the litter tray because they can confuse the feeling of labor with that of needing the litter tray.
Delivery can take a very long time, often a break of an hour between delivering kittens is seen, although if the break becomes several hours then you should consult a veterinarian as soon as possible.