Answered by Stephanie, Hiring Expert at AT&T Inc., on Tuesday, October 29, 2013
Congratulations! It is entirely up to you when you wish to tell your employer and your co-workers your good news. There are not any set guidelines or even recommendations as it can vary from person to person depending on personal circumstance. When you are comfortable and start sharing your news with family and friends, then I would recommend informing your employer and co-workers so you can work together to plan coverage, as well as allow yourself time to work with Human Resources on any questions you might have regarding benefits, etc.
Once again, congratulations!