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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It is possible in these small breed dogs to have a litter of just one puppy. They may not get much larger in the abdomen. They will have significant mammary development and milk production.
The gestation period is 62 days in dogs, so the timing fits. I would get her seen by a vet to see if they can palpate, ultrasound or x-ray to see if she is pregnant. Then you'll know what to expect and how many puppies are present. If there are no puppies in there, then it's probably 2 false pregnancies that you have been seeing at home. They resolve on their own.
My guess is that she probably has 1 or 2 puppies and she just didn't get all that large from it.
I hope this helps, let me know if you have any other questions.
Often times a false pregnancy is 1-2 months after a heat cycle. They coincide with what a normal pregnancy would last.
The behavioral signs with pregnancy typically come in the last 1-2 weeks. That blanket moving could be nesting behavior. It sure sounds like she is pregnant.