birth control
"mirena placed at 7 week postpartum check up.  six weeks later at mirena placement confirmation check up, strings not to be found and by ultrasound found mirena to be to low in uterus to be working effectively and an ovarian cyst noted (which I never had any problems with cysts before). Overall I like the mirena, minimal side effects. I think though that the mirena should not be placed until later in the postpartum period (past 10 weeks or so) to allow the uterus to go back to "normal" size."