Speaking candidly about her diagnosis, the 26-year-old opened up about her former health obstacles and how they put a strain on her relationship.
'For Nate and me, it was out first real challenge as a couple and it was hard and not nice, and not glamorous and very confronting,' recalled Tessa.
'But at the same time, life's not going to be perfect and we are so much better because of it.'
Continuing on, the stunner said she wasn't a fan of people calling her ability to bare a child 'a miracle'.
'I think that 'miracle' has come from the media and not from something that I've said, but in saying that, being pregnant is a miracle because growing a baby, it's pretty incredible when you think about it,' she said.