Is my hamster feeling OK?

I bought Heidi two days ago and she's adorable =] Only thing is, she's hardly pood at all and I'm worried she might have indigestion =[ I'm sure she's weed because I can smell it on one side of the cage and I've seen her drinking. She's been eating, and I've given her hamster pellets, hamster popcorn, broccoli and cherry tomato. Do hamsters bury their poo? I bought her a toilet but I've only found two poos in it.