"i spotted for the first 10 months i was on mirena...constantly! then was back to a normal non-spotting routine for two months. the spotting came back after that and i spotted for twenty days out of my cycle. not fun! it definitely affected my relationship with my significant other. i gave mirena a fair shot by having it for over a year and a half. although it does prevent pregnancy, the bleeding is a huge downfall for me. but i&#039;d like to point out that i have a sensitive cervix and was just informed that the mirena is not for people with a sensitive cervix."