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The Flip or Flop alum penned a sweet tribute to his partner on Monday, sharing a picture of the pair candidly posing for the camera on Instagram.
"When everyday is bring your wife to work day>>> 🙌," he wrote in the caption alongside the snap. "In awe of how amazing Heather has been doing throughout her pregnancy. Still coming to work, still working out, and still being an incredible step mom to Tay and Bray!"
The HGTV personality also noted that he has "been getting a bunch of questions asking about her pregnancy," adding, "So if you have any specific questions that I haven't gotten to in my DMs let me know below and I'll use this post to answer them 😃."
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Last week, the Selling Sunset star, 34, celebrated a special pregnancy milestone by posting a series of ultrasound photos, giving fans "the first 'glimpse' of [her] baby boy."
"This was my very first time seeing him since I found out his gender so it was so special 🥰," Heather captioned the post. "I love ultrasounds because I get to see him and hear his heartbeat."
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"As a new mom-to-be," Heather admitted that "these things give me flutters in the best way but it's also nerve racking because you want to make sure your baby is healthy and in the best condition possible."
"Overall the ultrasound went great and getting a little [peek] at our boy made my week 💙🙏🏻," she concluded.
The El Moussas were in the middle of in vitro fertilization (IVF) treatments and had even scheduled a date to transfer an embryo next fall when they found out they were expecting, they told PEOPLE exclusively last month.