I have a female cat who is barely two years old. She has been skinny her whole life and hasn't "lost weight" I guess you can say. At around 8 months she got pregnant and had one kitten. The kitten is now almost bigger than her mom and definitely has more muscle and fat than her mom. Her mom is mostly skin and bones. She eats wet and dry food and drinks normal and has normal bowel movements. Just recently she started to pee on the couch and we have been cleaning the litter boxes frequently so I'm not sure what this could be. She also occasionally throws up her wet food. Should I be worried? She doesn't seem hurt or sad just always hungry which I thought was normal because my other cats bother me for food all the time also. I think the being pregnant could have stunted her growth but I am worried that she is just not keeping any weight on. Please let me know if you have any ideas about this thank you!