I've had my marina coil for a year now and i've just started having blobby, dark brown, odourless discharge. what does this mean? how long until it stops?

Fie This Mortal Coil: First make sure you're not pregnant.No birth control is 100%(Except an aspirin tablet...held firmly between the knees).Next, bear in mind that you have a foreign body in your uterus;sometimes it can irritate the tissue and cause bleeding, even after a year.But if the bleeding/spotting continue for more than a week or gets worse & worse,with cramps,you'll need to see your GYN. Maybe have it removed