Help?

Jay

I’ve had sore breasts for about a week straight now, they’re tender and lowkey painful. I’ve also been getting weird cramps here and there that feel like period cramps. The only thing is my period doesn’t start for a good like 12 days and it was even farther away when my soreness and cramps started. I have a Mirena iud since june so i don’t know if this is just the iud doing its thing and being weird but i’m just confused.