I mated my cat(she is actually my uncles cat who is a breeder, but I take care of it) about 3-4 weeks ago and lately I noticed her nipples look more pink and they look bigger and definately has an increased apetite. Also he abdominal looks a bit larger than usual. However these past 3 days she has been showing signs that she is on heat. when I pet her on the back she is putting up her hind legs and I have heard her calling a few times as well. Im a bit confused??
The physical signs says she's pregnant, but the behaviour doesn't. Maybe it's a "false pregnancy" that's about to end? I guess you'll just have to wait and see. If you really must know mayeb you can take her to the vet and do an ultra sound on her.