She wrote, "We are so excited to announce... we're pregnant! #4andCounting #BlessingfromTheLord @joshduggar #19Kids."
Anna also shared the happy news in a "19 Kids and Counting" TLC teaser, saying, "One of the things we're really thankful for this season, is that we're expecting!”
She added that she is nine weeks along, just a few months behind sister-in-law Jill Duggar.
Anna continued, "I'm having a lot of morning sickness so it is difficult, but it's good because I know good things are happening. After Ben and Jessa's wedding, we were still visiting with the family in Arkansas, and that was really exciting to get to share with the family the exciting news."
Josh and Anna’s growing brood already includes Mackynzie Renée, Michael James and Marcus Anthony.