May 19, 2015 05:15 PM

As Jessa and Ben Seewald await the birth of their first child – due on their first anniversary – the newlyweds maintain that they’re still committed to adopting.

In an exclusive sneak peek at the aftershow of the 19 Kids and Counting finale, Jessa, who is four months pregnant, says that she and Ben are planning on attending classes for prospective adoptive parents.

“We hope to adopt a lot of kids,” Jessa, 22, told PEOPLE back in February. “If God blesses us with biological kids of our own, it’s not going to quench our desire to adopt.”

As for the sex of their first child, the happy couple says that they intend to find out whether they’ll be having a girl or a boy, but that they are not yet sure whether they’ll be keeping it a secret from the rest of the world.

They may even keep it a secret from the rest of their family, but Josh Duggar is convinced Jessa would never be able to keep quiet – and she takes his dare!

RELATED VIDEO: Jessa Duggar and Ben Reveal Plans to Adopt

The two-hour finale of 19 Kids and Counting airs Tuesday (8 p.m. ET/7 p.m. CT) on TLC.

Want more Duggars? Click here to get weekly updates on the stars of TLC’s 19 Kids and Counting in the Duggar Family Newsletter.

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