Cats may experience some changes during pregnancy, one of which may be personality changes. Some cats may become more dependent on their owners, require more attention, and may even become more friendly. This is because your cat’s hormonal levels change during pregnancy, which can lead to changes in their personality.
However, this is not the case for all cats. Each cat has a unique personality. Therefore, no unified answer can be given. Also, if your cat becomes more friendly, it's not necessarily because she's pregnant. It could be that your relationship with your cat has changed, or it could be that your cat is a very friendly animal to begin with. In short, a cat’s personality is determined by many factors, so their behavior cannot simply be attributed to one factor.
