How to tell if a hamster is pregnant?

Question

So, I bought a female Syrian hamster, who has so much energy it is not even funny. When I bought her, she looked a little chubby. I never worried about it until now.
I bought her from a Petsmart near me, and they only sell female hamsters (I think).
I'm not sure if she is just chubby or pregnant... I just got her 2 days ago. I'm not sure of her age

Here's her: https://mobile.twitter.com/Peyton_marie1/status/242744102108659712?photo=1

https://mobile.twitter.com/Peyton_marie1/status/242744400508231680?photo=1

Answer 1

It'll get fat and realllly bitchy.

Answer 2

going by the photos I'd say no at this stage but take her to your vet anyway to confirm because she could be in very early stages.