birth control
"I have inserted for a year now was excited about getting it because its a birth control that last for 3 years with no worries becoming pregnant. and I also have trouble with gaining weight...I'm very under weight for my age which is another reason why I got it...but unfortunately it does not work for everyone the same way. Good thing I'm not pregnant but haven't gained a pound, and my periods have became normal but stays on a little longer before, I have gotten acne and a little mood swings that's about it ...I will recommend it  but like I said as far as becoming pregnant it works but all the other side effects you may get them and you may not"