Yeah, you will be okay. It is all a state of mind. Can't say the same for your certification and ability to work for a living though.
As Al said, contact the Certification Dept. But, there is a grace period of 60 days but technically you can't work during that time. It will depend ultimately on your exact job, customers, engineer, etc. Previous CWI's can perform inspections when the engineer accepts their qualifications.
There are many variables here. And, since they now allow us to send everything in at 11 months before expiration, there really isn't much excuse for being late.
He Is In Control, Have a Great Day, Brent