How long will my cramping last?

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I got the Mirena IUD almost a week ago, which was also the week before my period. Ever since, I've had this constant, mellow cramping. I'm also slightly constipated but also pooping more often (I know that sounds confusing), which normally happens for me when on my period.

It's pretty much a constant state of light/medium-ish pain. Will it ever go away?