If you haven't sat down with him already, now would be the time to talk about this and see what his thoughts are in regards to this pregnancy. Abortion, adoption and keeping the baby are all options that should be explored.
Abortion is such a touchy subject anyway and for you to just blurt out that you were thinking about abortion when you just told him you are pregnant would send anyone into a tailspin. So give it a couple of days and then you and he sit down with no distractions and talk this through. Good luck.