Well, it depends on what kind of teen pregnancy you're speaking of.
I do not believe that someone any younger than twenty should be thinking about having a family. Even still, I feel that it's much more appropriate when you've long passed that age, and have a financially and emotionally stable household to provide for the child. Rushing into this sort of thing will only cause hurt for the mother and the child. Simply because you have intellect enough to stand out amongst your peers does not mean that you're ready to have a baby. o_o Sadly enough, a lot of teens seem to believe this.
On the other hand, if you're sexually active with the opposite gender, you're a fool if you don't have any means of contraception, or if you have no plan on what you'll do if the contraception fails. A condom isn't guarunteed protection. There's always a possibility that it could break or slip. Birth control pills don't always work, either. You have to know what you'll do if the situation presents itself, shall we say -- and equally as important, your partner should know what you plan on doing before anything happens. I support abortion, in this [and in all cases], because a teenager that is not fully capible of raising a child shouldn't have to give birth to it, especially if it's unwanted. If someone doesn't want an abortion for religous reasons...by that thought, you shouldn't have had pre-marital sex, anyway.
And then there's rape, which is a completely different situation. I don't blame the girl for getting pregnant in this case, of course, but I don't want to go further into that subject, really. 3:
</two cents?>