She wrote, ”We are so excited to announce…we're pregnant! #4andcounting #BlessingfromTheLord @JoshDuggar #19Kids."
The Washington D.C.-based couple has three children: Mackynzie, Michael and Marcus.
In a TLC clip, Anna said she’s “having a lot of morning sickness” in her ninth week of pregnancy, but isn’t letting it spoil the magical time.
"It is difficult, but it's good because I know that good things are happening,” she said.
Anna said “it was really exciting” to break the news to her family during a trip to her native Arkansas.
Josh, speaking with Radar in 2010, joked that he and Anna were “going for 25” children, adding, “We trust in God that he will only give us what we can handle.”
Watch the video on RadarOnline.com
19 Kids And Counting airs Tuesdays at 9/8c on TLC.