Sure.. But the case being discussed has a maximum frequency of 1 in a million every 18 (2 terms of childbirth) months, further reduced by needing to be a woman of reproductive age, fertile, etc etc.

This case of "one in a million" does not happen frequently.

> A 1 in a million event happens to about 100 people per day in the US.

This is a meaningless statement, you could choose literally any number for this statement, because you are missing the denominator.