I got Implanon in Dec. 2014 , and I was fine for the first few months , but for the last few months , I have had a blackish brown discharge in between my periods and it's near constant , sometimes it goes away for a day. But it's very irritating . I have none of the other side effects known with implanon . No weight gain , no acne , no mood swings. Is this normal , will it go away ? Some days it is very light , like spotting and other days it is much heavier.