We rescued a cat from the park about a month ago and took her to the vet when she got sick and stopped eating. She was given two shots to stimulate eating and some antibiotics. She got better, and now she is getting fatter. She walks low to the ground and seems to be squatting a lot. How can you tell if a cat is pregnant? We have not spayed her yet, but she has not been around any males since we took her in, and has been kept in the house. If she got pregnant, it was before we rescued her. Any information would be appreciated.