'19 Kids and Counting' Star Jessa Duggar's Pregnancy and Baby Update: Is She Expecting Twins?

May 07, 2015 11:59 AM EDT

'19 Kids and Counting' stars Jessa Duggar and Ben Seewald can't wait to welcome their firstborn into the world, and are keeping fans regularly updated as to the baby's progress.

Earlier this week, Jessa shared a pregnancy update on her Instagram account, saying that she is 100 days pregnant, and her baby was now measuring the size of a clenched fist.

"#100 days pregnant! So amazing to read about #BabySeewald's development each week! If you could peek inside yourself now, you'd see a baby the size of your clenched fist," she captioned the photo.

Jessa, 22, and her husband announced that they were expecting their first child in April, just a few weeks after her older sister, Jill, gave birth to her first child, Israel David Dillard. Since then, Jessa has been tracking her little one on a pregnancy app--and the picture she posted on Instagram reveals that she is 14 weeks and two days pregnant, according to UPI.

The soon-to-be-mom has also shared some of her pregnancy cravings; in another photo posted to her Instagram, Jessa is pictured having lunch with her husband at Arby's fast food restaurant.

"Lunch date with my man," Jessa wrote under the photo. "Yeah...because 'the baby' was craving Arby's. I love being able to use that excuse."

According to her caption, she and Ben ordered a complete meal that consisted of a roast beef sandwich, Arby's sauce and a Jamocha Shake, which is a combination of chocolate and coffee flavors.

While their baby's gender has not yet been determined, the young couple has enjoyed tossing around potential names--but noted it's not as easy as it seems.

"We are so excited. We have started talking baby names," Jessa said. "It is one of those things that is so special, picking a name for a baby."

Several days after sharing the news of Jessa's pregnancy, the couple hinted in a clip that they may be having not one, but two babies."You know, pretty soon we'll be making another little smoothie," the mom-to-be said in a TLC clip.

"Yeah," replied Ben, holding up a baby bottle. "Maybe more than one!"

In a separate TLC clip, Ben tells Jessa, "We can't wait to find out if it's a boy or a girl!"

"What do you think it is?" Jessa asked. "It could be both," he answered, grinning. "You never know!"

Meanwhile, Jim Bob and Michelle Duggar have also expressed their excitement regarding the newest addition to their family--who is due Nov. 1--emphasizing that being grandparents is better than they could have imagined.

"I've heard people say how wonderful it is to have those grandchildren," Michelle said in an interview with The Morning Blend. "It is like ten times better than what they said." "It is such a joy!" the Duggar matriarch added. "I am just so thankful to have all these grandbabies coming along, doubling the number of grandchildren this year. We've gone from three grandchildren to six."