There are a number of methods to confirm if a cat is pregnant or not:
- Pinking: of the nipple area, starts about 15-18 days after mating, most noticeable in first-time queens.
- Palpation: as early as 14 days, but most easily between 25-30 days (when the fetuses are about 1 inch in size).
- X-rays: best between days 38-49 when bony development in the fetuses is mature enough to show up.
- Ultrasound: about 99% accurate at 28 days, and can be used as early as 14 days; also has the advantage of detecting heart beats and so determining if the fetuses are viable.
Note: The average gestation period for a cat is 65 days.