"i received implanon in may of 2008. i am due to have it removed in 6 months however, for the past year i have experienced decrease in sex drive, weight gain of 30lbs and also mood swings. my periods have been very scheduled and fairly regular which was great until 4-5 months ago when i missed a period then was on time the following 2 months. last month i started a week early and it was unusually light, this month i started 2 1/2 weeks early and it has been off and on spotting for the past 5 days. i did call the helpline when i missed my period. they did not seem to concerned and i have not been able to find anywhere the birth rates on this specific birth control! i loved it until a year ago so the first half of my experience was great the last half no."