Levonorgestrel
birth control
"I've had Skyla for almost 2 years now, and I have never been completely happy with it. I was told it would take 6 months for it to "settle in" for the spotting to subside, which was true. But I still get stabbing pains from time to time without bleeding. 

After a year it seems it has stopped working because now I'm back to bleeding heavily and irregularly, I have a period sometimes twice a month and there is no "schedule". 

I am having it removed and switching to Mirena."