major uterine lining shedding with mirena?

Stephanie
so I've had the mirena for 2 and a half months now, and my periods have been a bit lighter than my periods pre IUD, but now with the mirena I shed major globs of what looks like uterine lining, in addition to the bleeding that I do get. I've never experienced this with my old periods before mirena, so is this normal? and am I the only one going through this? lol