Thanks for the additional information. It is helpful.
If you had witnessed a tie, then I could tell you that pregnancy was likely. However, if the intact male was around the female during her heat cycle unattended, then there would be a possibility that she is pregnant.
Signs of pregnancy are few until they are at least a month pregnant. Around week four of the pregnancy you might notice a thickening and the start of weight gain and some swelling of the breasts. Your Vet has a few different ways to determine if your dog is pregnant once they are this far along. They can run a blood test to confirm pregnancy based on hormonal levels. You can read about this test here:
They can also gently palpate the abdomen at about a month after breeding to feel for puppy bumps. They can perform an x-ray during the final week of pregnancy (8th week) and look for puppy skeletons which with her breed would be a good idea. This method can give you a good idea of how many puppies your dog may have. Ultrasound may also be available at your vet and can help determine pregnancy in a dog. Once a dog reaches the 8th week of pregnancy, you can frequently feel the puppies moving around inside of mom. I find it best to have the dog on their side and feel between the rib cage and hindquarters above the breast area.
Puppies are born approximately 57 to 64 days after breeding with the average being 63 days depending on when ovulation occurred. If you are not sure when she may have mated, this won't help a lot, but you might start counting from 7 days into her heat cycle for a general idea.
False pregnancy does occur in dogs and the symptoms are the same as if they were indeed pregnant. If in the fifth week following mating your dog is experiencing these symptoms, she may be pregnant and should be fed a high quality puppy food. I feed any female that has mated a high quality puppy food until it is determined they did not conceive. A puppy food supplies her with the necessary nutrition to support any pups and her own nutritional needs.
As for her itching, the fleas are the likely cause if you have not had her on a flea preventative. You will want her on a good flea preventative such as advantage, frontline, etc so no fleas are transferred to the pups. If she has hair loss as a result of the itching, then it is possible a skin dermtitis is present such as staph dermatitis or yeast dermatitis. These skin conditions are frequently seen with allergies. Staph usually occurs on the lower regions of your pet and tends to have small pimple type bumps. Shampoo containing Chlorhexiderm and/or Oatmeal can help with this condition. Yeast typically shows as a greasy area that has a sweet musty odor. Sometimes the skin can become inflamed, darker and thickened due to itching. Yeast likes areas such as between toes, armpits and ears. Selsun Blue Shampoo can help with Yeast dermatitis. When shampooing, lather and leave on 15 minutes before rinsing. These shampoos are not meant to be a cure, just a relief until your pet can see a Vet. Benadryl can be given to your dog, the dose is up to 2mg per pound every 8 hours for itching due to allergies.
You can read about allergies here: http://www.vcahospitals.com/main/pet-health-information/article/animal-health/allergy-general-in-dogs/428
Here is a site that goes over itching in dogs.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.