You need to be informed before you get it. It's possible that you'll bleed for 3 months straight after it's first inserted. I bled for almost 60 days. It's definitely annoying to say the least. However, after 6 months of having Mirena I love it. My period is very light. It's pretty regular. The insertion was easy, although there was definitely some cramping. It was well worth it. Any questions feel free to ask.