Thinking about 3 Bays Marathon

Ok, my Melbourne Marathon training didn't go to plan due to the flu about 6 weeks prior, lasting about 2 weeks. As a result I trained for and ran the half marathon. Well the half was on Sunday just gone (9/10/05) but I still want to run a marathon. I'm feeling half-way trained for a marathon. The Portland 3 Bays Marathon is on 30/10/05, three weeks away. I've got two weekends where I can run some long (30 km) runs. Midweek running will be shorter runs. I'm a bit concerned that maybe, just maybe, I've run out of time. So my plan is this, run the long runs as mentioned above and at the last minute (week before - just after the second 30 km run) make the decision whether to run the marathon or not. Seems like a good plan to me.