Yes, I realised that I sort of high-jacked this thread from the original poster, but I had already put all of the whole story on here, so I have been updating my issue on this thread. I really didn't want to start another thread on the same topic and have to repeat everything that was already here...
The OP's piggie already had babies, my Shauna did not. Today is the 73rd day that we have had her, and if she got pregnant at the pet store the day we got her, then this is the last day that she could have a baby. I have never been sure about her being pregnant, although she has been acting very weird since she started getting big in the belly. She looks so much different from the other GP female that we have and they are the same age. She is only fat in the lower abdomen, and she looks lopsided most days, but then she moves around and then looks thinner, then fatter again. So it has made me think it is 1 baby, but I doubt myself all the time.
I have taken her to the vet 4 times since we got her for a lingering URI, and she has had lots of antibiotics. For a while I thought it was the antibiotics maybe causing irritation to her intestinal system and making her look bloated, but she has been off the antibiotics for about 4 weeks now and still looks big. Plus she was just a baby herself when we got her, about 2-3 months old, and so she has been doing a lot of growing herself, so it is hard to tell. The vet couldn't tell (she tried to feel for babies and got bit hard for it!) and we really didn't think an x-ray was necessary. Shauna didn't bite for the first month we had her, but when her belly got bigger then she didn't want to be picked up and started biting anyone who picks her up and doesn't want her belly touched. She will let you pet her on her head, chin, neck, back, but if you get near her belly she freaks.