IUD No period?

Angelica • Single mom to an amazing little boy. Just trying to figure out my career path to support him and find our place in the world.
Okay so let me clarify the title. 
I have had the IUD for FOUR YEARS. Is it possible for the IUD to stop a period after being inserted for so long? I completely missed my Decmeber period. 
And there is no way I'm pregnant. Literally 0%. Haven't gotten any in 10 months! 
I'm just confused. 

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