I have had the mirena in since oct. 2013 and have not had any problems. The symptoms im having lately feel like they are pregnancy symptoms amd along with that, I ve had really bad lower back pain my shoulders kind of hurt, my breasts are sore, I began having a little cramping on the left side of my pelvis, and i missed my period last month,January. My period came in the beginning of this month but it was very light and it came way to early than I would normally have it. I have taken 2 tests about a week ago and both showed negative. Any idea about what is happening?