Chrissy Teigen will undergo endometriosis surgery this week (Picture: Getty, @chrissyteigen, Instagram)

Chrissy Teigen is understandably feeling out of sorts as her baby Jack, who died in September, would have been born this week. 

The cookbook author and husband John Legend suffered the miscarriage of Jack due to pregnancy complications. 

He was their third child as the couple are already parents to daughter Luna, four, and son Miles, two. 

In a heartbreaking tweet on Wednesday, Chrissy revealed she will be having endometriosis this week, coinciding with Jack’s due date. 

‘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. I have surgery for endometriosis tomorrow…but the period feeling this month is exactly like baby kicks. Sigh.’ 

Chrissy, 35, then shared a video of little flutters in her stomach and added: ‘Look at this I’ll pretend it’s him saying hi – it never stops.’ 

my little jack would have been born this week so I’m a bit off. I truly feel kicks in my belly, but it’s not phantom. I have surgery for endometriosis tomorrow…but the period feeling this month is exactly like baby kicks. sigh.