This will be the third child for the blonde beauty, who already has a seven-year-old son, Isaac, with Jo Rivera and a three-year-old son, Lincoln, with Javi Marroquin.
"I’ve had a lot of health complications leading up to this pregnancy and I was not ready to release such private information on my own just yet being that I am so high risk with this pregnancy. I didn’t want to announce just to have another miscarriage and suffer through another grief," she wrote.
Kail said elsewhere in the post, "Shortly after I started having complications, the option of having more kids was almost taken away from me. When I started thinking long and hard, I knew I wanted more. This was the choice I made. This is the baby I thought I wasn’t sure if I could have. I know this isn’t an ideal situation but I know everything will be okay."
Before she and Javi decided to divorce in May after four years of marriage, the couple suffered a heartbreaking miscarriage which we watched play out on the MTV reality series. Kailyn slammed her now ex-husband for his lack of support during the difficult time, and even said he blamed her for losing the baby.
“You know how much I wanted that baby,” he told her as she broke down in tears.
While Javi, a member of the United States Air Force, has since apologized for his behavior, he explained shortly after the news was revealed that there was a reason he lashed out.
“I knew it was no one's fault — it wasn't your fault, and it wasn't my fault. But it's crazy — it's like I needed someone to blame," he said. "That was part of the reason why me and you were fighting so much right after the miscarriage. I needed to blame somebody, and I was taking it out on you.”
However, Kail made clear she still felt he was "not helpful or sympathetic."
Scroll through the gallery to see all of her baby bump photos.