vita's right, even though there might be a slight chance that she might be pregnant (if she was kept with any males before you got her), it might also be a case of bloat, which is a very serious and even sometimes fatal illness. put it like this, its like if you had the worst kind of gas in your stomache and you feel as if you're gonna explode and not taking anything to treat it, that's how a piggie feels with a case of bloat. a well informed vet that knows about piggies will check her out and let you know if it is bloat or if its babies she's carrying in her belly. although if she is preggie, movement will usually be felt within the last 2 to 3 weeks of the pregnancy.

P.S: your welcome aubrey , glad to be of help