A cat's pregnancy, also known as the gestation period, typically lasts about two months, averaging between 63 to 65 days. However, it can range from 60 up to 72 days in some cases

. This period can be divided roughly into three trimesters of about 20 days each:

• First trimester (days 1–21): Few visible signs; sometimes subtle appetite increase and nipple changes.
• Second trimester (days 21–42): Physical signs like a growing belly and behavioral changes such as increased calmness.
• Third trimester (days 42–63): More pronounced belly swelling, nipple enlargement, nesting behavior, and increased appetite

Pregnant cats usually do not show obvious signs until about two to three weeks into the pregnancy, giving owners roughly a month to prepare for the kittens

. Veterinarians can confirm pregnancy by palpation around 2.5 weeks, ultrasound at 4–5 weeks, and X-rays at about 6–7 weeks to count kittens

. In summary, a cat is pregnant for approximately 9 weeks, with some variation depending on the individual cat