you worry about having your short Options exercised?
short answer is "no".
The long answer is also "no".
First-time Option Traders are often frightened by the
specter of someone taking away their stock by exercising
an in-the-money call. Many feel that they must maintain
a large cash reserve to protect against such an event.
Call Trading Tips
How to increase your yield on stock options, and covered
companies are very volatile and are not good covered
call candidates. Use
moving averages (5,20 day) to spot uptrending stocks
for a covered call