I am on the same train! We arrived at 11:15, checked in, then headed out for lunch & a little shopping at a local mall. Just leaving Lorton now, and happily ensconced in coach on the lower level; it is surprisingly roomy and calm down here. Husband & I just cracked open some adult beverages, and the kids are enjoying their cool reclining seats and extendable tray tables. Am very excited for this trip!
That's a pretty quick turnaround. Fortunately, there is a lot less commercial/freight traffic on the weekends, so you might make it in on time tomorrow. Our experience is that we travel on the weekends when we can because it really does make a difference.