In the snapshot, the mom-to-be appears to be meditating on an orange yoga mat with her eyes closed.
Rowland's post comes two weeks after the singer hinted at her pregnancy with another Instagram photo. At the time, the former Destiny's Child singer shared a picture of matching -- adult and baby sized -- Air Jordans.
"I'll be stuntin like my daddy.....," the 33-year-old singer captioned the snapshot.
Rowland and her manager boyfriend Tim Witherspoon got married in Costa Rica in May.