Okay, we're pregnant. That's bad. We can't support a child right now. My girlfriend (who is an INFJ) would be emotionally traumatized for life if she ever had an abortion, and I wouldn't want that for her. (To be completely honest, I wouldn't want to have to deal with that either.) Her parents would disown her if they knew she was pregnant. That would traumatize her too, because she's somewhat close to her family. Weighing the two alternatives, however, I think the former is worse than the latter. I would consult her for her opinion, and I am certain she would agree with me. (If she is uncertain, I could make the case against the former, and she would be convinced.) We ought to have the baby. My family would take her in, albeit give me a hell of a (hopefully figurative) lashing when they find out. That's okay, I shouldn't expect any less of them. The most important concerns are the well-being of my girlfriend, and the child. My sister has kids and my parents love them, so I'm sure that they could help us raise the kid and make up for any shortcomings our youth might have on the pregnancy. What is done is done, and I will do my best to be the best possible father and (eventually) husband that I can possibly be.
^that's my thought process. How do I feel about abortion in general? I think it's a sad state of affairs when you have to contemplate ending a life, but there are things that are worse in this life than death and sometimes it might be the only manageable option. I would never advocate it unless it is certain that the child's birth and life is going to be fraught with suffering, for both the child and the parent(s).
(If you're going to say I cheated, and my girlfriend's supposed to WANT an abortion, I'll tell you... you don't know my girlfriend. >_>)
BONUS ROUND!: If the baby is not mine, because she was raped- I would suggest she have the baby, and volunteer to help raise it as if it were my own. If the baby is not mine because she willingly cheated on me, I would break up with her.