Jessa Duggar's recent Instagram post on fast food has sparked rumours that the star could be pregnant.

The Duggar daughter got married to Ben Seewald on 1 November this year in a lavish ceremony during the TLC family reality show 19 Kids and Counting.

"I had to have a bite of Ben's Spicy Deluxe w/ Pepper Jack," the 23-year-old reality star wrote, while her husband displayed a Chick-fil-A sandwich.

"Add a little Texas Pete, and *WOW!* Your taste buds will be in heaven!"

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I actually got the grilled chicken wrap, but I had to have a bite of Ben's Spicy Deluxe w/ Pepper Jack! Add a little Texas Pete, and *WOW!* Your taste buds will be in heaven! 😋 #chickfila ❤️

A post shared by Jessa Seewald (@jessaseewald) on

Radar Online suspects that the Duggar daughter may have pregnancy cravings. Jill Duggar, Jessa's sister, got pregnant within weeks after getting married to Derrick Dillard and is expecting a boy due in March 2015.

Fans are also suspecting that the younger sister may follow in the shoes of the older sibling, in growing the Duggar family tree.

"They look at sex as a present from God and they couldn't wait to open it on their wedding day. I wouldn't be surprised if Jessa were pregnant already," an insider told In Touch Weekly.

Speaking about her marriage, Jessa once said that she and Ben are "thrilled to see what the future holds," Inquisitr reported.

The wedding of Jessa and Ben will be aired on TLC, during the next season of 19 Kids and Counting.