Is my fat mouse pregnant?

Question
one of my mice is getting fatter then the other and they're both females but i've had them only for a month and when they were in the petstore they were in the same cage with a male so i think she's preagnant but i'm not sure

Answer
Dear Megan,

If your mouse has been with a boy mouse within the past three weeks then she is very likely pregnant.  

Here is an archive post of mine with a lot of good links all about breeding mice and raising babies:

http://en.allexperts.com/q/Mice-3824/2008/10/Breeding-Mice-1.htm

And here is a post about just plain fat mice!

http://en.allexperts.com/q/Mice-3824/2008/10/Obese-mouse.htm

If you still have questions, do write back!

squeaks n giggles,

Natasha