"So it's true, I guess..." she wrote over the adorable clip shared to her Instagram Story on Tuesday, January 24. "2nd pregnancy you POP earlier."
The Dancing with the Stars alum posed in matching, chestnut brown athleisure wear and a pair of sunglasses as she exposed her growing baby bump to her friends and followers.
Along with their little bun in the oven, Murgatroyd also shares 6-year-old son Shai Aleksander with Chmerkovskiy, whom the couple welcomed in 2017.
As OK! previously reported, the dancer announced the happy news on Friday, January 13, following months of being candid about their fertility issues and IVF journey.
"After 2 years of constant struggle and heartache, 3 miscarriages and a failed embryo transfer...we have a healthy bun in the oven," she shared at the time. "All natural, it happened."
Murgatroyd clarified that she didn't realize she was pregnant for quite some time and even "danced through" DWTS in the very early stages.
"I started feeling weird, started feeling a little bit sick and a little bloated and I didn't want to test for weeks," she continued, confessing she finally tested around the "six or seven week" mark of her pregnancy.
"It just came up super quick and I was just shocked. It's been completely different from my past pregnancy. It wasn't like I jumped for joy and I shouted from the rooftops, 'Oh my God, I'm pregnant. Yay!'" she recalled. "It was more like, 'Okay, well let's see what happens because I've been through this four other times, and it hasn't worked.' So I was very skeptical. I didn't even tell Maks for a while."
Murgatroyd and Chmerkovskiy first met in 2009 and sparked a romance in 2012 after rekindling their friendship on the hit dance competition. The adorable pair tied the knot in July 2017 at City Hall in New York City, six months after welcoming their son into the world that past January.