How do you tell if a cat is pregnant? When I returned to my apartment today from a weekend at home, there was the sweetest little dilute tortie hanging around. She followed me to the dumpster and back, and every time I open the front door she is there. She looks healthy enough, but is pretty dirty and scratching like she has fleas. Her belly is pretty big and tight, but i don't know if she might be pregnant or worms, or what. I put some food and water out for her, thats all I can do for now. Any tips?