How can I tell if my hamster is pregnant?

If while walking or going through tunnels that its obvious her hips are bigger than her shoulders she's pregnant. The other things are all natural behavior. I Just bought a Syrian hamster 4 weeks ago and they said it was a boy but 2 weeks after i bought it "she" had babies. If you think she is pregnant, estimate 12-13 days from possible insemination and clean out the cage really really good and makes sure there is lots of bedding for her because they only have a 14 day pregnancy so wait and see if you end up becoming a grandpa! If she does have a litter, leave her alone for 14 days and only come around her to clean and refill her food dish and change her water (everyday). I know it will be a very long 14 days, especially for me cause I had just gotten my hamster fairly trained and was letting it run in my hands daily. Don't worry though this will give you plenty of time to read up on how to care for the little guys. I've left some info and places for adoption

hoarding food is normal, so is putting more bedding in her nest unless it is really as much as you say then it could be a sign. a sign that she is pregnant is if she stands up, you will see a bulge. as for the clicking, she may just not be used to you yet. do research because if she is pregnant, you need to separate her and her babies once they can find food for themselves. then you also need to separate the siblings eventually. (look that 1 up) also what color is she? there are risks with syrian hamsters based on gene combinations. good luck and if she is, start looking for RESPONSIBLE owners! Syrian hamsters will give birth around 16 days. be careful to not disturb her or scare her, as she may eat her young.One pup is born every 10 to 30 minutes, with a total litter size varying between species. For Syrians, the average litter size is 8, but up to 26 pups can be born. Wait around two weeks before handling them. At three to four weeks old a baby Syrian hamster is ready to go live on his own. If left with brothers and sisters a Syrian hamster will fight them viciously.

Her moving around slower. Her eating not as much. Her belly getting bigger.