On Sunday night's episode, Lowry's secret will spill out, and she'll finally have to start telling her friends and family the big news. That means she'll need to tell her two sons, Lincoln and Isaac.
In a promo for the episode, Lowry is seen talking to Jo Rivera, Isaac's father. She reveals the big news to him and says she's terrified of the boys' reactions.
"I'm ready to start filming about being pregnant," she says. "What am I gonna tell the kids? Are they gonna think I'm a piece s--t?"
In another sneak peek at the upcoming episode, Lowry can be seen feeling stressed, overwhelmed and sick. She drops Isaac off at her ex-husband Javi Marroquin's house then calls her friend to vent.
That's when the big news slips out.
"Dude you're so pregnant," the friend says.
Lowry is visibly jarred by the announcement, as she wasn't ready to reveal her pregnancy just yet.
See the clip below and scroll down to see the latest updates on Lowry's third baby, including its gender and possible name.
Did Kailyn Lowry Just Reveal the Sex of Her Baby?
The reality star had a friend hold a ring on a chain over her belly, trying out the old wives' tale that dictates if the jewelry swings in circles, it's a girl, and if it swings back and forth, it's a boy.
"It's a girl!" the friend exclaimed as the ring swung in circles. "I used to do high-risk maternal child health. I did it on every patient, it was always right."
Lowry is already mom to son Isaac Elliot, 7, whom she shares with ex-boyfriend Rivera, and son Lincoln Marshall, 3, whose dad is ex-husband Marroquin.
The 25-year-old confirmed in May that the baby's father is her longtime friend Chris Lopez, and she has since been discussing potential names with fans on Twitter.prevnext
Did Kailyn Lowry Reveal Her Baby's Name?
She asked fans, "I like last names for first names, how do we feel about Murphy for baby lo?"
She tweeted out the question with a simple yes or no poll, and the results were less than promising. With 39,149 voting, 78 percent said "no" to baby Murphy. That's more than 30,500 people against.
I like last names for first names, how do we feel about Murphy for baby lo?— Kail Lowry (@KailLowry) July 16, 2017
If she listens to that crowd, Murphy is off the list.
Based on her following tweets, it appears she is taking the poll to heart and is keeping her options open.
She shared a screenshot of herself Googling how long she had to name her child after birth. According to her search, she has six months to register a name, so that should be plenty of time.
Ok cool pic.twitter.com/ZGoH3EcBg1— Kail Lowry (@KailLowry) July 17, 2017
"Things ended pretty badly," a source said to Hollywood Life. "He's been a real ass to her, and has made it clear he doesn't want anything to do with the baby. Kailyn's hoping he will change his mind when the baby arrives — she doesn't care about the financial side of things."prevnext
Kailyn Lowry Shares Oceanside Maternity Photos
Lowry took to Instagram to share her stunning maternity photos.
In a series of three pictures, the MTV star poses in a long black, off-the shoulder gown that shows off her growing baby bump. In two of the photos, she finishes of the understated look with a red flower crown.
The day prior, she shared a sneak peek of the photo shoot on Instagram, posing on the beach by a mountain of rocks. "Had so much fun taking my maternity pictures," she wrote.
Click through the maternity photos below to see more.