I was at school with a person who was younger than their nieces/nephews because the mum had been “caught out†during menopause, having believed she had an abdominal problem she turned out to be pregnant. She had already had children before, of course ( hence the nieces and nephews).I believe it is generally possible to get pregnant. They said to use contraception until one full year period-free when I was at peri stage.
However, I guess it all depends on your personal circumstances as to your own likelihood. I expect someone with medical expertise will let you know the likelihood.