Hamster sines of pregnantcey

Whats the sines of a pregnant hamster? And what do they do when they are pregnant? Do they sleep a lot?

yes she should sleep a lot as she is using much more energy to produce her litter.
she should be eating a lot more food and occationally the become more aggresive. also she should look fat.

In a pregnant hamster you may notice slight changes to her behavior such as moving around her bedding etc. She will be pregnant for around 16 days and will usually start to show pregnancy signs 10 days after mating. Her abdomen will become swollen and the nipples will become more prominent.

I had a hamster once and I didn't know she was pregnant until I found babies one day...unfortunately they all died