Well, at least you’re correct that agendered people aren’t cisgendered.

Here are some of the identifying terms:

• Cisgendered: You have a gender that matches what people guessed your gender was.
• Transgendered: You have a gender that doesn’t match what people guessed your gender was.
• Agendered: You don’t have a gender.
• Fluidgendered: Your gender is not stabluzed, and constantly shifts (often due to ‘fuzzy’ signals in gender horomones).
• Bigendered: You have two gender states you alternate between (often relating to reinforcing feedback loops and cyclic changes between Testosterone and Estrogen that alternate between the two feedback loops).

As for if you were told your cat was female, and then got your female cat pregnant, then yes, that was an assigned female cat that was a trans male cat. It was assigned a gender (by the vet) and society acted on the assigned gender (you bought it), and then the cat disagreed with the gender role you insisted it follow (by humping your female cat instead of not humping your female cat as expected). This scenario effectively *is* the definition of assigned gender vs transgender.

The fact your assigned female trans male cat got the assigned female cis female cat pregnant is just evidence that the job you and your vet did assigning gender couldn’t even muster on an animal unable to voice consent just demonstates how lousy your methods are even when the consent factor and social norms aren’t as much part of the equation as they are in humans.