Serena Williams Talks Winning the Australia Open While Pregnant & Accidentally Revealing Her Baby Bump

The tennis superstar opened up at the 2017 TED Talks conference, and revealed that her Snapchat pregnancy announcement was sent out by mistake.

Serena Williams recently revealed that she's pregnant, but it turns out she didn't mean to share that news at all.

Sitting down with Gayle King at the 2017 TED Talks conference at the Vancouver Convention Centre on Tuesday, the expectant tennis superstar said the Snapchat pic that announced her pregnancy was posted by mistake.

WATCH: Surprise! Serena Williams Announces She's Pregnant in Swimsuit-Clad Snapchat

"It was an accident," Williams admitted. "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."

The Snapchat shot, posted April 19, was quickly deleted, but the bell couldn't be unrung, and Williams' rep confirmed the news of her pregnancy to ET later that day.

"I didn’t tell a lot of people, to be quite honest, and I’d been saving it," Williams explained. "On social media, you press the wrong button and [it's done]. Thirty minutes later I missed four calls and I'm like, 'That’s weird.'"

WATCH: Serena Williams Shares Baby Bump Shot, Writes Heartfelt Message to Unborn Child

The 35-year-old mom-to-be said the mistake actually ended up being "a good moment" and that she and her fiance, Reddit co-founder Alexis Ohanian, were "only going to wait five or six more days" to share the exciting news.

In Williams' inadvertent announcement, she revealed that she was 20 weeks along, which means that she was pregnant when she won the Australian Open back in January.

According to the tennis icon, she found out about her pregnancy a few days before the tournament began, and the situation made her "nervous."

"I wasn't quite sure what to think, but I knew that at that moment, it was really important for me to just focus," she told King. "Pregnant or not, no one knew and I was supposed to win that tournament. Every time I play, I'm expected to win. If I don't win, it's actually much bigger news."

WATCH: Serena Williams Hits the Beach Following Pregnancy Announcement -- See the Pic!

Williams went on to win her 23rd Grand Slam singles title at the Open, defeating her sister, Venus Williams, for the victory. The champ opened up about what it's like to face off against her sister, explaining that they never go easy on each other, but they never hold a grudge either.

"On the court, we are mortal enemies," she shared, "but the second we shake hands, we're best friends again."

Williams also said that she has every intention on returning to tennis in the future.

"I definitely plan on coming back. I'm not done yet," Williams said. "This [motherhood] is just a new part of my life. My baby's going to be in the stands and hopefully cheering for me."

WATCH: Serena Williams Shows Off Her Curves and Amazing Abs 'Just Because' in Sexy Bikini Pic

After revealing that she was pregnant, Williams' rep told Reuters that the tennis legend will not be competing for the rest of the 2017 season so she can focus on preparing for motherhood. Check out the video below to hear more.

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