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On x rays you should be able to see pups on or about day 45. What you may be seeing in your dog is a false pregnancy which will show all the same symptoms of a normal pregnancy.
Information on pregnancy in dogs http://www.petplace.com/article/dogs/keeping-your-dog-healthy/reproduction-breeding/pregnancy-in-dogs
False pregnancy in dogs http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/reproduction/pseudocyesis-false-pregnancy-in-dogs
You may want to ensure during the next heat season that a dog be able to be brought to you on a daily basis through the second stage of heat or you may want to try artificial insemination as there are kits for that
artificial insemination kits
there are videos on youtube to show you how to do this