Implanon
"I've had Implanon now, for almost 5 years. I have gotten it changed out at my 3 year mark. 
The insertion process is similar to an IV getting put in. The second time, piece of cake; a pinch. After the insertion, the first time, it was swollen and sore for 2 weeks, but thats normal, your body needs to get used to it.  Second time, it healed in a week. It was inserted in the exact same spot one was taken out from.
Since being on this, the first year, periods were sporadic but normal, then they waned off; the last few months before I changed my implant, I had light spotting for a few days and then after I changed it no periods at all. I have had no pregnancies, mood swings or weight gain. No hormonal changes via sex drive or breakouts. I love it."