hmmm, just a thought... do you suppose she's pregnant now??

I know you asked about a cat but here's my experience with Annie dog who was a stray.
When Annie dog came here, I took her to vet to be spayed and came home. They got her ready for the procedure and I got a phone call from vet saying he saw a scar on her that could be from being spayed. I said... can't you tell by an xray if she's been spayed... and I was told .. No, not to be 100% sure. Anyway they asked me if I wanted them to proceed with spaying and I said... No, I would take my chances that indeed she had been spayed... turns out she was because she has never gone in heat.

Is it possible to look on your cat's belly and see a spaying scar? Dont know if one would be able to see it or not. Maybe vet could shave and look for scar.

Do you know if she ever had a real home?
What are the chances that someone cared enough to have her spayed?

Kay in NC