My air bag light was on for a week but has disappread since, should I still get it checked out?

I own a 09 honda civic and the air bag light stayed on (while I drove) for about a week and then suddenly no longer stays on when I'm driving. It only pops up when I'm starting the car.
Is this a problem that should be addressed immediately? And why did it disappear all of a sudden?

Probably a fault in the cars computer. I would go a the a garage and get it checked out incase anything more serious happens. The might laugh at you but better safe then sorry.