Pregnancy in cats lasts about nine weeks. Early signs are easy to miss. About three weeks after mating, an expectant  cats nipples will become enlarged and pinker. To find out for sure if your cat is pregnant, take her to your veterinarian.  Fetal heartbeats can be detected with ultrasound around day 24.  Around week five, a pregnant cats abdomen begins to swell noticeably.  Like pregnant humans, pregnant cats tend to eat more and sleep more.  Unlike humans, cat mouths may be eating for eight or more. Her personality may tend to change during this period. They may become more affectionate and seek more attention.  Give her the affection and attention that she needs. Start preparing that special place with a very comfortable cat bed for that special day!