How can I tell if my female "Syrian" hamster is pregnant?

I bought a male "Syrian" hamster and female "Syrian" hamster from the same PETCO about 1 month or 2 ago. They' ve done their thing a few times now(if you know what I mean). Once they did it in the car, then in the cage. She started rejecting him and not letting him mount her anymore. I didn't see any action for a couple days, and then I notice them doing it again. This time she let him mount her and do his thing. It has been about 4 days to a week and underneath her stomach looks bigger, but I don't know if she is pregnant or just eating a lot. Also I have noticed her storing food in her cheeks. I NEED A REALLY GOOD ANSWER...PLEASE HELP ME! (I have called PETCO and they said that breeding is not recommended and that they are not justified to answer my question) :-( I REALLY WANT TO KNOW!!...PLEASE HELP!! (P.S) I was told by PETCO that hamsters are solitary, but I depends. If they meet before they get in their enclosure (cage) then they may not fight. They have been living in the same cage for about 1 1/2 or 2 months. Also sleeping in the same igloo (little house) for that long also. So I think they are good for now. I am switching between "Myspace", "Hamster breeding information", and "Yahoo Answers" PLEASE ANSWER!!
Answer:

if you started to breed your hamster, wait 18 days, 1 moth to be sure. About 18-30 days she will give birth...

RichyRic... at Yahoo! Answers Visit the source

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