In an Instagram Story on Thursday night, Melissa said she was relieved and excited over the pregnancy milestone.
“Now that the babies have started kicking I’m not getting much sleep and I’m getting bigger by the day. I was really small before but I’ve definitely popped out now,” she laughed.
“I’m very happy that the babies have started kicking. I was getting a little bit worried."
Melissa, who is 21 weeks' pregnant, said "Baby A" started kicking last week, prompting concern over "Baby B's" lack of movement.
But thankfully, the mother-to-be felt the second baby nudging her two days ago.
“I’m feeling very relieved. I was a little worried there just having one kick but we’re all good now," she told her 110,000 followers.
"Baby A is so active. I get a few hours of peace but then gives me a little nudge, whereas Baby B takes it a little easier and it's just a nudge here and there."
The 32-year-old, who said she is eager to find out the twins' genders, revealed that overall she has felt "really good".
"My skin's pretty bad at the moment, but that's the only pregnancy symptom I've had for almost a week. I'm very lucky, I think I'm almost over the hump now," she said.
"No morning sickness, my boobs feel fine again. I just look really tired."
Appearing on A Current Affair earlier this month, Melissa and Bryce spoke all about their upcoming nuptials and growing family.
"We've got a list of about 10 boy and girl names, and because we're having twins, we need two of each. So yeah, I think we're pretty set," Melissa explained.
Bryce then added that the shortlisted names were "very unique".
"I guess that's kind of a real testament to our relationship," Bryce said. Yes, indeed.
Bryce exclusively admitted to New Idea last month that "it all happened very fast" but said he couldn't be more excited.
“It’s been a whirlwind, but we’re so incredibly happy,” Melissa added.
The pair say they’re planning a “low-key” wedding – nothing like their TV nuptials. And while Mel has big plans for the day, their focus is now on their family.
“I’ll have two babies by the time I walk down the aisle,” Melissa said.