a few weeks ago we "adopted" a cat from a family that couldn't keep her, and earlier today she was at our back door with a kitten in her mouth! she continued to appear as though she were in labor for quite awhile...then it just stopped. no more kitties and she seems completely calm and relaxed and is taking care of the kitten. every once in a while she seems to have heavy breathing and appears uncomfortable and licks here tummy, but then she stops again. she had the first kitten over 7 hours ago and now there are no signs of labor. is this all normal? will i wake up to more kittens? thanks! (p.s. we searched all around for other kittens, inside and out, and didn't find any)