When does a cat start showing bump in pregnancy?

A cat's pregnancy typically lasts for about 63-65 days, but the visible signs of pregnancy may not be noticeable until the third or fourth week. Around this time, you may start to notice a slight swelling or enlargement in the abdomen, particularly in the lower belly. This bump will gradually become more pronounced as the pregnancy progresses, and by the end of the sixth week, it should be quite visible.