All my female Gerbil's are fat with no male?

and i don't no y ther so fat i give them food when they need it.
Answers:
Make sure you're not giving them more than they'll eat. They'll pack it away and eat at their leasure, and sometimes eat too much. My Sugar does that between pregnancies because she has a sunflower seed addiction and those are very fattening.
There are actually a lot of things you can do other than double check all of our gerbs to make sure a male wasn't just pretending to be a girl to get . well you get the idea.
Make sure you're not overfeeding. Feed twice a day (i usually put a 1/8 cup scoop of food in twice a day in each tank - and the tanks both have 2 gerbs. If there's still food in there, I throw it out and replace with the scoop. It'll take a little research to figure out how much they're actually eating and adjust accordingly. One gerb will eat about a tablespoon per day.
You also want to check the nutritional value of the food you're giving them. it should be no more than 12% protein and 7% fat if they're not breeding. It's different if you're breeding them. I usually try to keep the fat as low as possible, and my gerbs all love their wheel.
Make sure they have enough to do to give them plenty of exercise. Not all gerbs like the wheel - some of them look at it like it's a torturous chew toy that moves and give you the appropriate evil eye - but mine get very angry with me when I take it out.

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maybe they are eating too much, without enough exercise or movement

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gerbils can eat a lot so if all of them are fat and theres not male then they can't be pregnant. try not to over feed them they are just overeating. gerbils will eat a lot even if they are full.