Spotting?

I’m debating whether or not to call my doctor because every appointment that could be pregnancy related I have to keep on the DL because I live with my Mother at the moment and I’m looking for a car so I have to use hers. But anyway I have the Mirena IUD, I’ve had it for about 10 months. Still pretty new to it. But the last three weeks I want to say I have been experiencing light spotting off and on. Which isn’t really normal. I’ve also been having very very mild cramping I want to say two weeks ago. I’ve been having back pain but that could be and most likely just from my back injury I had a few years ago. But I took a test and it was negative but I’m still having these symptoms. Should I call my doctor or?