About five years ago, I got two kittens, about 3 months old. They ran away and one came back, but the other didn't. Now, five years later, I think that same cat has come back. He/she has been extremely aggressive to my other cats, but surprisingly friendly to me. He/she seems to recognize the house and seems quite comfortable exploring the house. Here's the problem: his/her private parts look like a male cats', but his/her stomach is very swollen and hard and it really seems like he/she's pregnant. It's definitely not fat, because he/she is very bony (unhealthily so) on the rest of his/her body. She's been around for a month and now has a healthy small amount of fat. I think his/her stomach has swollen more in the month that he/she's been around. So normally I would conclude that she's pregnant, except his/her private parts look like a male cat's. He/she weighs 14.2 pounds, but is a petite cat and still on the thin side. I will try to get pictures soon. Any advice/thoughts on this will be very appreciated! Feel free to ask me any more questions if you need more information.