We had a disucussion on this in a PSRE lesson a while back. Long answer, here it comes xDD
Well, I first have to say, that either side had it's pros and cons. My arguments for Pro-choice, are as follows:
-The woman might have been raped
-The woman may be unfit to bring up the child for medical, social or financial reasons
-Noone is ever forcing you to have a child if you don't want it
-Some people (some, I'll emphasise this) think that the fetus before twenty four weeks is not really harmed because it couldn't survive outside the womb before this time
-If you were raped, the child could bring back memories of that incident, and may also start to ask questions about who it's father is.
My pro-life arguments:
-A life has been made, no matter how small or unable it would be to live outside of the womb
-Some people who want children cannot have them, and you are able to have one and do not want it, how is this fair?
-You should face the 'consequences' (that word makes it sound so awful... D

or your actions. If you don't use contraception, then that's (in most cases) your fault
-If you decide to get rid of the child, that thought will always be with you, whether you were happy with your decision or not.
Personally, I'm Pro-Choice, just because I think it would be cruel to bring a child into the world that might suffer because the mother is too young, or too poor, or treats it badly because she didn't really want it. But, I can see for both sides, as I have explained :3