Etonogestrel
"I had it implanted in October of 2013. I didn't have a period at all for the first year and then the week of the one year mark I got one. Totally normal about 5 days just like my periods before getting pregnant. From then (oct 2014 to now June of 2015 I've had a period about every 3-4 months. They are totally normal or very light. That part has been GREAT! The negative side effects I've seen have been some break outs on my face, mild mood swings and irritability. But it hasn't ever gotten bad enough to make me want to get it removed. I have sex regularly and it has done its job. No babies. And I also started losing weight after being on it. I would say this is a great choice if you don't wanna worry about taking a pill every day!"