birth control
"So I've actually had this implant since I've been 15, and I'm by 18. When I first had it put in, I bled and spotted for 6 months, which I was warned would happen. After that my cycle was very irregular, either every couple weeks or couple months or even 4-5 months without. It is sometimes worrying going so long without one, because I always wonder if there's something else wrong. But I have to say I love the implant, it's super effective. I get no cramps or mood swings and my cycles are very light and last 2-4 days at most.  I would definitely recommend this."