I also wanted to chime in and suggest, that no matter what you decide, to seek some counseling (lots of free therapy options exist for students). I had some post-partum depression (after my planned pregnancy) and awful anxiety, and I wish I had not waited so long to deal with it (talk therapy helped - no drugs were needed).
I also chose abortion when I was 19, and should have had some counseling after that. The pregnancy hormones do a number on you, whether you carry to term or not!
And just to share, I do not and never have regretted the choice I made all those years ago, AND I am sad I had to do it. None of the choices are easy, or simple.
I also wanted to offer a hug and wish you good luck, mama!