uterus not shrank back to normal after birth!?

Saw a midwife the other day and she wanted to look at my tummy and was pushing down on it and I have some pains when she pushes down and she told me that my uterus has not gone down which should of gone after 2 weeks of giving birth and told me I should go hospital if it doesn't go down what do you guys think ? Why isn't it going down :( 
UPDATE: I had an all natural birth 

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