So exciting — baby boy Roloff might arrive a little earlier than expected!

Little People, Big World star Tori Roloff is expecting baby No. 1 with her husband Zach Roloff — but the pregnant 25-year-old hinted that she might go into labor before her due date in her latest baby bump update.

“36 weeks pregnant, felt my first contraction!” she wrote on Instagram. “One centimeter dilated, baby Roloff is the size of a watermelon.”

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Yup… still pregnant. #ZandTpartyofthree

A post shared by Tori Roloff (@toriroloff) on

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She’s currently about four weeks away from her due date, but she’s already experiencing warning signs of labor! Fans flooded the new mommy-to-be with comments about their own experiences to help her prepare for what’s to come.

“Girl, you’re ready! Walk, walk, walk, and rest up!” one fan suggested. Another fan said she gave birth at 37 weeks — which means baby boy Roloff could make his debut by next week!

Although it’s hard to tell whether Tori will deliver early or not, it’s definitely clear that she is so excited to become a mommy. Ever since she announced that she was pregnant, she’s been sharing regular baby bump updates on social media under the adorable pregnancy hashtag “#ZandTPartyOfThree.”

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This baby will mark the first grandchild for the Roloffs — and family matriarch Amy Roloff is already a doting grandma-to-be! Earlier this month, the 52-year-old teamed up with Tori’s mom to throw Tori an adorable black-and-gold-themed baby shower — which was hosted at Roloff Farms in Hillsboro, Oregon.

“I'm so excited! The day is almost here. Us grandmas can't wait,” Zach’s mom captioned an adorable group photo taken at the baby shower.

But baby boy Roloff won’t be the only grandbaby for long — he’s going to be getting a cousin soon! Zach’s twin brother Jeremy's wife Audrey is about 21 weeks pregnant with their first child and they are expecting a baby girl.

Scroll through the gallery below to see Tori’s baby bump progress!