Chrissy Teigen honored her late son Jack on what would have been his due date

• Chrissy Teigen revealed in September that she and John Legend suffered a pregnancy loss.
• Teigen on Saturday shared photos to her Instagram account honoring Jack.
• She recently underwent surgery for endometriosis and has been candid about her experience.

Chrissy Teigen paid tribute to her late son Jack on what would have been his due date.

In September, Teigen and her husband John Legend revealed in a heartbreaking Instagram post that they suffered a pregnancy loss. The couple had planned to name their baby boy Jack.

"We are shocked and in the kind of deep pain you only hear about, the kind of pain we've never felt before," Teigen wrote. "We were never able to stop the bleeding and give our baby the fluids he needed, despite bags and bags of blood transfusions. It just wasn't enough."

On Saturday, the "Cravings" author commemorated Jack's due date with an Instagram post.

"Can smile all day but thinking of you on your due date, bug," wrote Teigen, who is also the mother to four-year-old Luna and two-year-old Miles.

On her Instagram Stories, Teigen shared a photo of three bracelets decorated with her children's names.

"Today was your due date. We love you forever," she added.

Teigen previously mentioned Jack's due date earlier in February, marking the "week he would have been born" with an emotional Twitter post.

"My little jack would have been born this week so I'm a bit off," she wrote. "I truly feel kicks in my belly, but it's not phantom."

The next day, Teigen underwent surgery for endometriosis, a chronic disorder that typically affects the pelvic cavity, after experiencing painful cramps. Although having endometriosis can increase the chances of infertility, women can still become pregnant.

Teigen later posted a topless selfie on Valentine's Day that urged her followers to practice self-love. Her endometriosis scars were visible in the photo.

Teigen previously said her pregnancy loss was "transformative"

During an appearance on "The Ellen Show," Teigen said her pregnancy loss inspired her sobriety.

"In a way, he really saved me because I don't think I would have discovered therapy and sobriety and this path of really feeling good about myself," Teigen said.

In the same interview, Teigen admitted that the experience felt "so long ago" and was a "blur."

"Being Thai and being raised in a house that was very open about loss, I think it was very helpful," she said. "It can be a beautiful thing and it was a very transformative thing."

Teigen added there were "constant reminders" around her home, including maternity clothes that she purchased for her third trimester.

"You don't ever imagine it happening to you," she said. "I think the craziest part was for me. I was like, 'I hear these stories about other people. This kind of stuff doesn't happen to me.'"

"So, when it does, you're just so shocked," Teigen said.