Serena Williams' big pregnancy reveal on Snapchat was a total accident

It seems tennis star Serena Williams' accuracy is better on the court than on Snapchat. A week after surprising the world with the news that she's pregnant, Williams admitted during an interview Tuesday at the 2017 Ted Talks Conference that she didn't actually mean to send out that selfie of her growing baby bump. The photo of a swimsuit-clad Williams, with the simple caption "20 weeks," almost immediately made headlines.

"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 I'm going," Williams said. She said she hadn't told "a lot of people to be quite honest" because she was "saving" the news.

"You know how social media is, you press the wrong button and ... ," Williams said. When she checked her phone 30 minutes later, she was surprised to see several missed calls. "But it was a good moment," she said. "I was going to wait, literally, just five or six more days [to share the announcement]."

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Williams said she found out she was pregnant just two days before the Australian Open, where she bested sister Venus Williams to claim her 23rd Grand Slam singles title.

Watch Williams get candid about her pregnancy reveal below. Becca Stanek