[WinnieTheHam]

It does sound like she's pregnant. Most likely past the 10 day mark by now seeing as she's gained a lot of weight in a short amount of time, as well as looking a lot bigger. Who's looking after them? It might be a good idea for them to note down when she looks thinner than usual. You'll know the birth date then and when to separate the hamsters at 4 weeks old. If not then that's fine, you'll be able to guess their age when eyes open around 2 weeks old. Fingers crossed everything goes well for her.