Mirena
"I'm 19 and recently had the Mirena removed. I had it inserted after I had my son when I was 16. I really think it's a great birth control, it's a fool proof way to not get pregnant again (which at my age I obviously need). I don't have any complaints when it comes to weight gain, my skin actually got clearer and for the most part had painless, lighter periods. The only reason I rate it a 7 is that I did have several ovarian cysts that weren't dangerous but I'd consider definitely annoying. Another thing: I think it better suits married woman because the risk of any infections that cause pelvic inflammatory disease is obviously less with one partner."