19 Kids and Counting Josh, Anna, Mackynzie and Michael Duggar of TLC's reality-TV series "19 Kids and Counting." Photo: TLC

There may be yet another Duggar baby on the way. A Season 8 promo for next Tuesday’s episode of TLC’s reality series “19 Kids and Counting” teased the possibility that the eldest child of Michelle and Jim Bob Duggar, Josh, and his wife Anna, are expecting their fourth child.

The one-hour special, set to premiere Nov. 18, will follow the couple, both 26, and their three children, Mackynzie, 5, Michael, 3, and Marcus, 1, on a road trip to Chicago, according to TLC. Their RV adventure will take them to Anna’s sister Priscilla’s home as she celebrates her gender reveal party with her husband, David.

“Anna has decided she is going to take a pregnancy test,” Josh said in the commercial released Tuesday. “I’ve taken a few pregnancy tests since Marcus has been born,” Anna said while the couple was shown looking down at a pregnancy test. 

Anna has also since teased the idea she is expecting after posting this telling message to Twitter Tuesday night: 

While it appears viewers will have to wait until the show airs to find out if the Duggar couple is expecting, the episode title, “A Reveal to Remember," does hint that they may be having baby no. 4. The synopsis, however, does not indicate the extended episode will include a pregnancy announcement.

“The DC Duggars make it to Chicago in the nick of time for David & Priscilla's gender reveal party! Who will be right, Team Boy or Team Girl? Later, the family enjoys the sights of the 'Windy City' and caps off their trip with a camping excursion,” reads TLC’s synopsis.

Anna discussed her desire to welcome another baby while visiting a farm with her children during Wednesday's episode of “19 Kids and Counting,” “DC Duggars Hit The Road.” After seeing a cow give birth, Anna said, “I definitely want to have more children, but watching the momma cow in labor made me thankful that I wasn’t pregnant yet. But then when you see the birth, the fresh new life, it’s just like, ‘Aww, that calf is so cute.’ But babies are even better. Hint, hint,” she said while nudging Josh.

If Anna is pregnant, she won’t be the only Duggar family member expecting. Michelle and Jim Bob’s fourth oldest child, Jill, is currently pregnant with her first child with new husband Derick Dillard. Last month the newlyweds announced they are expecting a baby boy next spring.

“19 Kids and Counting” airs Tuesdays at 9 p.m. EST on TLC.