POSSIBLE SIDE EFFECTS FROM SKYLA??

Okay, so, a little background. I'm 17, and got the Skyla IUD on November 2nd, 2016. I got a normal period a couple days later, which I was expecting, a light period mid-December, and haven't had one since. I know periods can go away with the Skyla, but I'm paranoid so I took a pregnancy test just in case, which came back negative. These past few weeks I have been exhausted. And i mean really, deeply, can't-keep-my-eyes-open exhausted. I have depression, so this isn't abnormal for me, but it's never been this bad. I can seriously sleep for 14 hours straight, be up for 8, and then need to go back to bed. My psychiatrist wants me to get my thyroid checked, because that can cause lethargy, but I don't have insurance at the moment (long story). Anyhow, can the exhaustion be a delayed side-effect from the Skyla?