Is it normal?

Is it normal to be 26 weeks pregnant and have a uterus that measures 31 weeks? If it's not then what could cause that to happen?

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    05/29/14
    Doctor hasn't said anything. But I have 4 oz of fluid around the baby.
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      05/29/14
      I'm tire and the checkup went great
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      About Tiffany Warden
      Current: Conrad, Iowa
      Birth: December 28
      On Moms.com since: Nov 15, 2013
      24 just married