How soon can you tell if a dog is pregnant?

I have a toy poodle and she mated with my mother-in-laws 11month old yorkshire terrier. It was his first time mating and this will be her second litter. She was breed 11/28/06, 11/29/06 and again 12/01/06 how soon can I tell if she took? Does anyone know about how much it is to get the Vet. to see if she is... show more I have a toy poodle and she mated with my mother-in-laws 11month old yorkshire terrier. It was his first time mating and this will be her second litter. She was breed 11/28/06, 11/29/06 and again 12/01/06 how soon can I tell if she took? Does anyone know about how much it is to get the Vet. to see if she is pregnant? I felt her tummy and I fell a tiny lump that wasn't there before but I only feel one.
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