"i had the mirena put in march of 2008 after i had my daughter. i was 32 years old. no complaints other than in the beginning i swear i could feel it inside me. that went away. i did gain some weight. occasional very light spotting. i never had a period until the past few months.  the doctor said that&#039;s because the mirena is running out of the hormones. my period lasts 2 weeks (just a pantyliner), and a week off. getting my new mirena next week. i would highly recommend this birth control."