Apart from the above posts (which I think are right on in regards to answering your question), I find a really good, modern movie that deals with this topic directly is Juno. Juno, the main character, is very true-to-life in regards to how she is affected by pregancy. Although I do think the movie glorifies teen pregnancy a bit (in that the end is a bit too-good-to-be-true), I still think it goes a long way in answering your question.
If you'd like to stay in the movie realm, but see the intensely negative side, try watching the 80s movie For Keeps. I'll never forget when I saw that film. (It came out when I was in high school.) With its postpartum depression, screaming couple, and screaming baby, ... it pretty much cemented my virginity for many years to come!
And finally, I'll end with a personal story from when I was a student teacher. I remember Amanda, ... she was probably the smartest student in our junior AP class, ... and nine months pregnant. I'll never forget when she stayed after school one day talking with my mentor teacher and I. I remember Mrs. H commenting, "Yeah, I always wondered about that guy you were going out with. You have always been such a wonderful girl, ... and he was such bad news! The whole staff was thinking, 'Yuck!'" Amanda just stood there for a moment with her mouth open and then she started yelling, "Mrs. H, ... WHY didn't you TELL me that!?! If someone, ... ANYONE would have told me, I would have listened and wouldn't be in this situation right now. Instead, no one cared enough about me to tell me the truth. NO ONE." She stormed out of the room.
After being privy to that conversation, I have always tried to be BIG on communication with my students. And once they figured out that I wasn't afraid of this taboo subject, the questions started coming. In regards to you, lhexie, my advice is to COMMUNICATE with your friends (and/or students if you are studying to become a teacher). Try to encourage them to make wise decisions in regards to sex and marriage, ... and support them if and when they make mistakes.