Etonogestrel
"I got this implanted in May 2015, so it has been almost a year. It started off great, light spotting, not pregnant, less cramps. 6 months in I started to get heavier periods (My period was never heavy before I got this) and they would be longer each month. I would get about a week off and it would come back. My cramps have gotten continually worse the past few months, as well as my acne. I have also gained 20 pounds (but that could also be attributed to me going to college) but overall, this birth control does what it's supposed to, with some uncomfortable side effects."