IUD advice

So after having our daughter 3 years ago I got the mirena IUD. well we decided we wanted to start trying for another baby so I got the IUD taken out. Well my periods aren't normal. I've only had 2 periods lasting a week long in 9 months. Was it the IUD that made my periods not come back? I'm nervous we won't be able to conceive without me going on hormones or something. Has anyone else had this problem?