You'll notice her abdomen growing larger as well as her mammary glands. Good luck! Other symptoms won't really show until she's getting ready to go into labor. It's still a good idea to have a checkup at the vet. Once she's further along in her pregnancy, the vet can do an x-ray or Ultrasound to determine the number of puppies she'll be having. Good luck and if you have any questions about the labor/delivery process, let me know!