There are three choices.
Abortion: you go in for the procedure, and they cut the baby into pieces and then suck it through a tube into a bottle. That is the abortion procedure for the smallest amount of weeks. (Later, you end up having to rip off the limbs and then crush the skull and spine, and after that, salt poisoning that also burns off the outer layer of the skin. I don't really want to get into detail here, because it's gruesome, but if you have an abortion, those details you will have to live with.) Mind you, the baby's heart is beating at 6 weeks, and even though it is not fully developed, a newborn isn't either, neither is a five year old. It doesn't mean you should kill them. There is something so sacred and innocent in the life of a young one -- the younger, the more vulnerable, the more full of love and trust for you, the mother, to protect.
Adoption: if you don't want to raise the child, you give birth, and that child goes on to LIVE. To see the sunsets and the sunrises, to walk through this life trying to find his or her own way like everyone else of us, to love and to be loved back, to taste the warm taste of heated milk and the fresh taste of water.
Parenting: if you don't want the baby right now, fine. Other women have done it, and done it well at 15, but if you believe that adoption is the best option, then maybe it is right for you. And although it is one of the best experiences of life, it is wholly up to you and what you choose.
Just remember that pregnancy doesn't happen without a reason -- don't mess with what's meant to be.