Humans bodies are amazing, we don’t even know how many people are intersex because we don’t chromosome test infants and it might not be possible to find out otherwise.
“A 46,XY mother who developed as a normal woman underwent spontaneous puberty, reached menarche, menstruated regularly, experienced two unassisted pregnancies, and gave birth to a 46,XY daughter with complete gonadal dysgenesis.”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2190741/