"i did not experience any weight gain, but i do have insane periods. i won&#039;t have one for a month and then 44 days later i&#039;ll have a period for two weeks. i don&#039;t really care about the random periods because i&#039;ve suffered from this my entire life, but i&#039;m coming to the end of my 3 years, and my mood swings around the time of my period are horrible. i&#039;m emotional, and just crazy. i&#039;m not sure if this is due to the implanon, but its gotten severe in the past 5 months, to the point where its disrupting my life and my relationship. i loved the implanon except for these past 5 months. very effective form of birth control, but not so great at stopping the periods."