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The former model and cookbook author took to Twitter to tell fans she was feeling "a bit off", seeing as Jack "would have been born this week".
"I truly feel kicks in my belly, but it's not phantom," she said, adding: "I have surgery for endometriosis tomorrow...but the period feeling this month is exactly like baby kicks. sigh."
The stomach cramps Chrissy is experiencing are seen in more severe cases of endometriosis - which is when cells from lining of your uterus (the endometrium) grow outside of it too, attaching to other parts of the body.
They are not to be confused with phantom kicks, which is when pregnant women, and those who have recently been pregnant, continue to feel kicks when they aren't occurring.
According to Healthline, this can be because "stretching of the uterine cavity or abdomen in pregnancy increases the growth of nerve receptors," essentially tricking the brain into thinking your'e being kicked when you're not.
They add: "While the mechanism behind flutter kicks is unknown, researchers believe it may be related to changes in the somatosensory homunculus or proprioception during pregnancy" - which basically means the nerves in your stomach are working in overdrive, without communicating with the rest of your body.
Sharing a video of her stomach contracting, Chrissy wrote: "Look at this. I'll pretend it's him saying hi - it never stops."
It comes after Chrissy and her husband, John Legend, lost their son Jack back in September, sharing a series of devastating pictures from that day in the hospital room, and revealing they were "shocked" and suffering "deep pain".
A month later - following a period of understandable silence - Chrissy told fans she was in a "bit of a grief depression hole" and went on to pen an emotional essay about her experience, sharing details of her loss and the emotional journey she was on with her supporters.
"A lot of people think of the woman in times like this but I will never forget that John also suffered through these past months, while doing everything he could to take care of me," she wrote.
"I am surrounded, in a human therapy blanket of love. I am grateful and healing and feel so incredibly lucky to witness such love."
In the essay, which she published on Medium, Chrissy also addressed the intimate photos that were taken in the wake of their loss - for which she faced a minor backlash online despite the fact that she and Legend were grieving.
"I cannot express how little I care that you hate the photos," she said.
"How little I care that it's something you wouldn't have done. I lived it, I chose to do it, and more than anything, these photos aren't for anyone but the people who have lived this or are curious enough to wonder what something like this is like.
"These photos are only for the people who need them. The thoughts of others do not matter to me."
She added: "Jack will always be loved, explained to our kids as existing in the wind and trees and the butterflies they see.
"Thank you so much to every single person who has had us in their thoughts or gone as far as to send us your love and stories. We are so incredibly lucky."
She and John are also parents to daughter Luna Simone, four, and son Miles Theodore, two.
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