running on empty

Wow, I am out of shape.  Who would have thought that a true 18 month hiatus from running seriously would cause my body to change?  That, coupled with pregnancy, and I have a long road ahead to get where I was back a few years ago.  I went to the gym this evening and pounded out almost three miles.  I did half of it on an elliptical and the rest running a ten minute mile while listening to Counting Crows.  I've definitely missed my love affair with running, especially processing things while I run.  It's nice to get back in the routine.  I really want to run the half marathon in April.  I ran the full nine years ago this year.  Amazing how time flies.  I'm not really interested in doing the full right now, but the half would be doable.  I think?