Not a 100% guarantee. Taking the pill is not without risk. Secondly, taking the pill goes with the 2nd line of defense and that is when the decision between the male and female decide on the risk of having sex, and share that responsibility equally. The pill is not the first line of defense, it's the saying "No" to sex that guarantees no risk to pregnancy. That is without a doubt the first line of defense for a woman. Everything else is a shared responsibility and risk, except the teen woman has much more to lose when she's college bound.
Again, ya'll are totally hung up over the misnomer $1/day thing. Again, think of this as a scholarship opportunity because requirements do come with it.