Jessa Duggar shares pregnancy update on Instagram

SPRINGDALE, Ark., May 6 (UPI) -- Jessa Duggar celebrated her 100th day of pregnancy Tuesday.

The 22-year-old reality star marked the occasion by sharing an update with fans on Instagram. Duggar is tracking her progress on an app, and posted a screenshot showing she is 14 weeks and two days pregnant.

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

Duggar and husband Ben Seewald announced they are expecting their first child in April. The reality star shared a photo of herself with Seewald on Sunday, writing, "Lunch date with my man! Yeah... because 'the baby' was craving Arby's! I love being able to use that excuse."

Duggar and Seewald married in November 2014, and recently revealed their personalized wedding vows. The couple currently star on TLC reality series 19 Kids & Counting, which follows Duggar's parents Jim Bob and Michelle Duggar and their 19 children.