January 11, 2015 3:20 PM EST

Beyonce posted a photo on her Instagram Sunday that has her fans guessing if Blue Ivy’s going to have a sibling soon.

In the picture, the 33-year-old singer, who’s married to Jay Z, is buried in sand next to Blue Ivy, who recently turned three, and it appears there’s a mound atop her stomach, People reports. The “baby bump” has people guessing if Beyonce is hinting at a second pregnancy.

Read more at People.

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