IUD Question

I currently have an IUD. Before my IUD, I was on Seasonale, which gave me my period once every 3 months. I got my IUD inserted 3 months ago and was supposed to get my period last Wednesday and it is currently Monday. I was informed that after 6 months to a year my period could go away overall. But it has only been 3 months, so I'm confused. Anyone able to help?