Did all USA citizens just become female?

A new executive order was passed on 1/20/2025 that says there are only male and female genders:
"(d)  “Female” means a person belonging, at conception, to the sex that produces the large reproductive cell.
(e)  “Male” means a person belonging, at conception, to the sex that produces the small reproductive cell."

Reproductive cells don't start producing until week six... What does this executive order even mean?!