To blame the coil on my exhaustion?

[Fanfeckintastic]

I got the mirena coil inserted in November and I've been really pleased with it overall, nothing major in terms of mood swings etc like I've experienced on other contraceptives.

Recently though I'm just absolutely exhausted, I can't figure out what it could be, I haven't felt such fatigue since I was pregnant and the only thing I can think it might be is the coil?