Levonorgestrel
"Those that first get Mirena should not be discouraged. In the first few hours, I experienced menstrual-like cramps. Then, I spotted for a straight two months! But, eventually, the spotting stopped and I've only spotted for a couple of day in months and months afterwords. I've had Mirena for almost a year and it's been a blessing knowing I'm protected and never have to worry about dates and times and 'did I take my pill today?'"