can any one tell me what the signs should be that my bitch is pregnant. she was bred on the 19 sept

Hi,
as far as i know, at about 3 weeks into pregnancy she may go off her food a bit but only for a week. This is really the only sign that i know of, there may be more. But the best way is to make a vet appt they will palpate the stomach to try to confirm and they can also do a scan/x-ray to see if there are any pups.
Good luck
Em

http://www.schaferhund.com/pregnancy.htm

She is about 3 weeks just over, so you wont notice an awful lot yet.
Bitches vary.  Some get very clingy and fussy.  Some from 3-4 weeks suffer with morning sickness, and go off their food, others eat and eat like crazy.
At 3-5 weeks you may notice their nipples up and seem larger and pinkish. By 6 weeks you should know if she is in whelp if she is short coated, and has an average litter.
You can have her scanned.  Your vet can do it or you can get petscan to come to your home to do it.
Or you can wait and bide your time and then you will know for sure.
In a short coated breed from 4 weeks you can see circular discs appear around the nipples.    If you own other dogs they may more more interested in sniffing her vulva as if she smells different.  At 6 weeks plus she may have a clear discharge which leaks from time to time, not all do.

Good luck. Have you never bred before ?
Its an exciting time thats for sure.