Generally after a cat has been mated in heat, the time of mating needs to be remembered. The most accurate way is 28-30 days after mating, when an ultrasound can be taken to see if there is a foetal sac in the uterus, and then secondly an X-ray can be taken at 42-45 days of pregnancy to see the bones and number of cats. There are also some cats that have increased their food intake after mating, their abdominal circumference is getting bigger day by day, their nipples are reddening and they are experiencing pregnancy vomiting, etc. Pregnancy can also be assessed through these side observations.
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