Here comes debbie downer.. ME..
I have to add in here that BC pills are not 100 % effective and you can get pregnant on them even if you take them religiously. I have 3 times on 3 different pills. Some folks just have that kind of luck..

Im 35 nearly 36 and just had a baby that I got pregnant with while taking ortho tri cyclen...
I dont want to freak you out or make you worry needlessly, but it DOES happen and at 16 that'd be a hard lesson to learn. The only 100% effective BC is abstinance or hysterectomy.... somethng I didnt know when I got pregnant with my first.
.. Ok, Im done being the downer.. carry on.