Serena Williams says she accidentally announced her pregnancy

Last week, Serena Williams announced that she's 20 weeks pregnant on SnapChat shocking fans. Turns out she did it by accident. Speaking to Gayle King during a session on TED Talk, Serena admits, "Well, actually it was an accident. I was on vacation just taking some time for myself and I have this thing where I've been checking my status and taking pictures every week to see how far along