Took my cat to be spayed and she's pregnant?

You should be more upset you allowed her to get pregnant there are already far to many unwanted cats and kittens in rescue or killed every year and i mean killed because they are perfectly health just aren't enough homes. At three week pregnant it is hard to tell if a cat is pregnant without doing a scan . In many case the vet will often ring owner and ask do you still won't her spayed as the can still at that early stage.