my auntys doberman female always went up to women who were pregnant guarded them and would nussle there tummys lol it started doing it to my mum before she knew she was pregnant with me my aunty said ur pregnant... mum later finds out she actually was lol
I know animals can "sense" when a women is pregnant, but before you, I'm not sure, it's not really a sure thing that you're pregnant if your cat is acting differently towards you, it could be just something going on with the cat internally.