After the Mirena iud.. HELP

I had the Mirena iud and it has been out for 1 year & 7 months. My periods are so irregular. Sometimes I get two a month. Other times I don't get a period for maybe two months. Sometimes just spotting. It's so unpredicatble. Anyone ever gone through this? Does it ever get better? has anyone got pregnant after the Mirena was out? How long after?