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I am sorry to hear you are worried about your Rotty. I am Rebecca; I am a veterinarian and will do my best to help.
Have you confirmed by xray or ultrasound she is pregnant? If she is 64 days, she would probably not be able to hide all the puppies under her rib cage; she should be showing. Her uterus is not really under her ribcage, but farther back in her abdomen.
It is possible this is a false pregnancy, or that she has a smaller litter than last time. I would consider an Xray to see if she is pregnant, and how many puppies she has.
How is your Rottweiler today? Any puppies?