"i am 23 years old, and i have had the implanon for almost 3 years. i will get it exchanged next month. i have not had any terrible problems. a year or so ago i had a light period that lasted for at least a month.  i usually have a light period of 3 days about every month. it has not caused me bad moodswings or any weight gain.i do eat healthy and walk. overall, it has been great and prevented pregnancy! i recommend it to my friends."