The Shameless star, who welcomed daughter Flame at the age of 50 after IVF treatment, turns 54 in January, so has given herself until March next year to get pregnant with her partner Paul.
However, her 34-year-old boyfriend has voiced concerns for Tina's health if she were to become a mum again, after she suffered from potentially deadly pre-eclampsia during her previous pregnancies, and the mum has revealed he's yet to be convinced she could cope with another.
Speaking to the Mirror, Tina said: 'March is my cut-off point. If I'm not pregnant by then, I'll have to leave it. I think, for me, over 55 is too old to have a baby.
'I'm 54 in January - but if someone else wanted to have IVF at 63, then whatever floats your boat.'
'We have to make a decision by February,' Tina said. 'I would go for it in March if Paul gave me the OK in January. I could still cope with sleepless nights.'
Tina famously lost a staggering 12 stone, taking her to a size 6 - something which she's overjoyed about. The star recently attended a ball and couldn't wait to take to Twitter to thank those she credits with her transformation, including the surgeons who fitted her gastric band and carried out liposuction.
Listing those who'd made an impact in her appearance, she followed with a tweet that reads: 'ALL BECOZ OF YOU JUST MENTIONED FOR THE FIRST TIME IN MY LIFE I FEEL,AND KNOW I LOOK GUD,I JUST CRIED TRYIN MY DRESS ON,ALL CHANGED MY LIFEX'
KATIE AT LPOOL LIPO,SUZANNE AND MICHELLE AESTETHICALLYYOU FOR CLEARLIFT,BOTOX,FILLERS,MINDBLOWING,HOSPITAL GROUP SURGERY,GASTRIC BAND AMAZIN— Tina Malone (@TinaMalone23) September 7, 2016
ALL BECOZ OF YOU JUST MENTIONED FOR THE FIRST TIME IN MY LIFE I FEEL,AND KNOW I LOOK GUD,I JUST CRIED TRYIN MY DRESS ON,ALL CHANGED MY LIFEX— Tina Malone (@TinaMalone23) September 7, 2016
The former CBB star lost an incredible 11st 4lb in just 16 months when she had a gastric band fitted five years ago, reaching a size 8 and slimming down to 8st 2lb.
Tina's now down to a size 6, and has had further surgery to remove the excess skin left from her weight loss procedure, as well as breast implants, a facelift and an eye-lift.