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A cat's gestational period is 63-67 days, depending on breed (Siamese cats can carry longer than other breeds, for example).
You can't determine for certain how long the pregnancy will last from the time you feel kittens moving, as there are many factors that influence this such as how large the litter is, or the body size and type of the queen. Some cats show movement 5 weeks before birth, others show movement only days before birth. The best way to estimate birth date is by knowing when she mated, but if this isn't known, your vet can offer you a better idea.
Maybe about 2 weeks more