To all you idiots being all 'man up, you shouldn't be fucking if you're getting her pregnant' yada yada, can you not fucking read? He already explained that he practices safe sex and wraps that shit up. Unfortunately the 3% or whatever of the time condoms don't work, this shit can happen. Morons. It's nothing to do with irresponsibility, it's just bad fucking luck.
I was actually in this same situation two months ago. My girl was depressed and confused, but she knew that it was inevitably the right thing to do. All you can do, like many people have said, is to be there for her and listen to her. Be attentive, talk to her but don't push it if you can feel her getting upset. Go out of your way to make sure she's comfortable. And I mean this both before and AFTER she gets the abortion. My girl had the surgery and came out crying, so you know that taking that pill and watching your insides coming out of you is going to be a fucking difficult thing to deal with. Don't expect it to be over and everything to be normal again, it could take a while. Then again it sounds like you have your head on your shoulders, so most of this should be common sense..