birth control
"Ok so mind me, I was only had the implant for a little over a month before I couldn't deal with the side effects anymore. Horrible headaches, acne, fatigue, and atrocious mood swings! One second I would get furious at something ridiculous and the next, I could cry because I felt bad for getting so mad! Anyway, obviously the doctors told me to wait it out, eventually in about 6 months or so, my hormones would settle. I didn't have time to HOPE that these symptoms would go away as a had boot camp in 4 months, and I couldn't go being a crazed, hormonal mess! 
Every woman is different. My family has a past of being sensitive to permanent /strong hormones such as the bar. If you know you are sensitive as well, I would NOT recommend getting this"