Have you told your boss?

Lisa
I am completely stressed out because I'm 20 weeks pregnant and I haven't told my boss yet. I only started this new job a little over a month ago, and I didn't want to say anything while I was interviewing since I was in my first trimester still. 
I work for a Fortune 500 company and nearly everyone on my team has kids, but I'm still freaked out. I don't want to disappoint them, nor do I want my job to be at risk. I know that I have to let them know soon...
Have you told your work yet? If so, how did it go?