"We are so excited to announce…we're pregnant," Anna wrote on Twitter Tuesday night. "#4andcounting #BlessingfromTheLord @JoshDuggar #19Kids."
In a video for TLC, the 19 Kids And Counting couple also revealed how far along they are!
“I am nine weeks pregnant and I'm having a lot of morning sickness," Anna said. "It is difficult, but it's good because I know that good things are happening."
In a recent episode of the TLC reality show, Anna said she has “taken a few pregnancy tests” since her son Marcus was born, but all were negative.
The couple said they found out shortly after Jessa Duggar and Ben Seewald's wedding day.
"We were still with the family in Arkansas," Anna shared in a new TLC video when asked how she announced the news. "It was really exciting to get to share with the family the exciting news."
The oldest Duggar child and wife already have three healthy children— Mackynzie, Michael, and Marcus—and live in Washington D.C. where Josh is the Executive Director for the Family Research Council.
In a recent interview, the religious couple said they were not planning how many children to have in their lives, but rather leaving it up to God.
"It's really not about the number of children you have, but how well are you doing with the children that God has given you," Josh said. "We're really just going to take it one at a time. I don't think you can say we're going to set out and say we're going to have five kids or four or three. We have no control over that. God has the control."