The 28-year-old took to Twitter to warn her 288,000 followers against making jokes about the serious issue, with Malin having previously lost a baby herself.
"April Fool's is approaching so please don't lie about being pregnant," she wrote.
The former Love Island star has previously spoken candidly about the premature death of her baby daughter, Consy, in 2019.
Having been born seven weeks premature, Consy-Gloria, who was named after Malin's late mother who had passed away from stomach cancer in 2017, had a rare heart condition.
At just 4lbs and 8oz's, Consy was too small for treatment, with Malin telling OK! Magazine that all they could do is "pray for a miracle" before Consy passed away in January.
Malin, who split with Consy's father Tom Kemp not long after her tragic death, has since been vocal about the effect the devastating loss had on her.
As well as advocating for more legal rights for women who miscarry or experience the loss of a child, Malin has also been candid about losing a baby - saying she even attempted suicide in the wake of Consy's death.
"The death of a baby is not a rare event. It can happy to anyone. I share my story, not just for any reason, but to give strength to those who have gone through similar, to drive improvements in the bereavement care and support available for those affected and in remembrance for my little girl Consy and others," she wrote on Instagram, alongside a picture of her caesarean scar.
"I for one know that I felt so low I attempted to take my own life - from previous events and also losing my baby. Straight after losing my baby girl I had no family around me and no support apart from my closest friends.
"Hospitals did not reach out to me apart from to discuss the post-mortem and to register her birth and death at the same time. Not everyone has somebody there for them - It all links together, and the only way that we can create change and more awareness is to spread the word."
She concluded: "We remember the babies born sleeping, those we carried but never held, those we held but could not take home, those who came home but could not stay."
If you are struggling with baby loss, email Bliss on [email protected]
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