The 22-year-old singer found out she had a cyst on one of her ovaries earlier this year, which caused her to fear that she would never become a mum like her pregnant band mate Una Healy.
She told British newspaper the Daily Mirror: 'I was really scared. I was worried that I wouldn't be able to have babies.
'It's every woman's first thought in a situation like that - but I had a really good doctor who put me at ease.'
Rochelle added: 'I'm sure I'll be fine now, but to be sure I have to be checked out regularly.'
Despite Healy's impending new arrival Wiseman added that she won't be having a baby with her boyfriend Marvin Humes any time soon.
She said: 'I'm not really to have kids yet, but I'm setting my sights on being the best aunt to Una's baby.'