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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. Thank you for your question. The typical gestation time for a female cat is 60 to 63 days. In some situations, the first day of fertilization of the eggs is unknown and is guessed at. Sometimes after breeding, it can take a few days for the actual eggs to be fertilized so the pregnancy can go to 65 and 67 days. In this situation with your little one, could she have just been fertilized a little later than what is suspected?
Timing when they are ready to birth is the tricky thing. After mating it can take a few days or so to actually have ova fertilized. So if the typical gestation is 60 to 63 days, could she go to 65 to 67 days? One of the best things to do at this time for her would be to get her to your vet so they can take an x-ray of her to give you a head count of the number of kittens to expect. This is very helpful for owners to be able to know when birthing is done.
Has she been progressively getting bigger in her abdomen?