It sounds like you might be observing some physical changes in your puppy that are making you think they are pregnant. These changes could be due to a number of things, such as:
* Growth spurts: Puppies grow very rapidly, especially in their first year. This can cause changes in their body shape and size that might resemble pregnancy.
* Bloating: Bloating can make a dog's abdomen appear larger and can be a serious medical condition.
* Other medical issues: A number of other health issues can cause changes in a dog's body shape.
* Confusion: It is possible you are misinterpreting normal dog behavior for signs of pregnancy.
It's important to consult your veterinarian. They can examine your puppy and determine the cause of the changes you are seeing. If your puppy is experiencing any health issues, they can provide the necessary treatment.