which gender?

Question
I have Dwarf Hamsters but I can't tell what gender it is.
One of my hamster doesn't trust me enough yet to let me check so I don't know what to look for. I'm also not sure if one of them is expecting cause it lays around alot and is looking fatter than usual. But i'm not sure if I just have it on a diet that has too much nuts.  

Answer
Hi Denise,

    Here is a good site on dwarf hamsters that shows how to see what gender they are.
    http://russiandwarfhamsters.tripod.com/hams/id19.html
    
    It is very hard to tell if a female dwarf hamster is pregnant. But they say that if she gets fat fast and is pregnant, you can expect the babies within 2-7 days.

    If you have anymore questions, please write again.

Thank you for writing!