Ok. First off, teen sex and teen pregnancy are two different things.
Teen sex is what teens do in order to release those hormones.
I personally believe that sex is an adult action. I believe that if you go and have sex, reguardless of the age, you should expect the consequences. (Pregnancy is NOT the only consequence of sex, especially at a younge age). There are also mental developmental issues, addiction issues, self-esteem, abuse, physcial develomental issues, emotional issues (many tend to disreguard), and many more.
Note: You don't have to be a religious-freak to think this. I'm not.
Teen pregnancy is even a bigger issue. I'm pretty sure your friend didn't purposly want to get pregnant, however, some teens purposly want to.
There have been many stories about "groups" of teens going off and getting pregnant, either for a political purpose, or a rebellion, who knows? It's just... it's discusting, in my opinion.
Pregnancy is something that should be appreciated by one who purposly is fitted for a baby.
17 highschool student, still in school, with not even one bit of a career skill... isn't the ideal mother. Yea, it's possible to raise a content child at that age, and even younger, however, I find it to be a very horrible choice. Why should you have a child, that is yours, that YOU'RE the parent of (Note:That I didn't say YOUR parents are the parents of), and you can provide fully for that child?
Look at the realistic facts of life. Besides some exceptions, relationships (at least good, healthy, long ones) last around 7 years. That is the average basic relationship standard time. You have a baby at age 16, and there is a high possibility that that same boyfriend who's promising you to be by your side, (or that girlfriend) can easily walk away.
And, when it comes to pregnancy, I think it's a great time to make a selfish decition. I, personally, would get an abortion (take the pill, of course) if I were to ever get pregnant younger then what I expected to, especially if I need help from my parents to take care of myself, nevermind an actual baby.
Sure, there's adoption. However, I'd rather not have a child walk into my life twenty years later and say that they're my child. I'd feel horrible.
So in all total, I'm definatly not for teen pregnancy.
A stupid mistake like that, can cost you your future, for a child you didn't even want in the first place.