Serena Williams made a big announcement on Snapchat last Wednesday: Alongside a baby-bump-revealing swimsuit photo, she wrote “20 weeks.”

But it was also a brief announcement, as the mom-to-be deleted the shot shortly after posting it.

It turns out that Williams’ happy news — which her publicist confirmed later that same day — was meant to remain private for a little while longer.

“Well, actually it was an accident,” the top-ranked female tennis player explained at the Ted Talks conference in Vancouver Tuesday. “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.”

Those weekly updates were only meant for her eyes — and maybe those of her fiance, Alexis Ohanian — but as she added, “You know how social media is, you press the wrong button and … ”

The world knows.

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