'It was really difficult to even think that [about being unable to conceive]. I was scared to say it out loud because I didn't want to jinx it,’ she explained in her latest interview.
However, the former Myer ambassador explained her fears evaporated when she finally held her newborn daughter in her arms for the first time: 'When she came out, I was just so overwhelmed; I was crying, it was incredible.'
Jen also detailed how having a baby made her reassess her body image.
'I have so much more respect for my body, instead of worrying about it aesthetically,' she said.
Jen’s comments come just months after she felt the wrath of nasty mum-shamers, who took exception to a photo on the model’s Instagram account showing Jen wearing a hat while she left her daughter's head uncovered.
'Where's the baby's hat?' asked one of Jennifer's followers, while another added: 'Loving the photo by why does Mummy have a hat on and not Bubba?'
Jen was quick to respond to her critics, admitting: 'Bub was under a beach umbrella two seconds after the picture was taken.'
After explaining the situation, a number of fans showed their support for the Aussie model asking people to keep their negative opinions to themselves.
'Geez! Someone had to say that! [Frankie] has an awesome mummy, as if she's going to let her baby burn," one kindhearted user wrote. "I'm laughing as a mum, as people just love to stir the pot.'
'Seriously. Listen, "perfect mummy", keep your judgements to yourself, mind your own business,' a third fan commented while another added:
'Mummy shaming at its very best! No wonder new mums find this time even more difficult these days with the constant commentary and criticism. Why do you feel the need to comment? Any wonder rates of postnatal depression have never been higher.'