“An ancient being who can travel through time and space in a flying 1960s police box? That I can buy, but a woman able to do things while on her period? YOU’VE GONE TOO FAR, SIR.”
Okay, but…all those women companions? Of course there are shark week supplies. FFS.
And that’s assuming that Gallifreyans have periods, or that 1200+ years old is not post-menopausal for them.
Also, like… she spends more time on Earth than Gallifrey? By a lot? Pretty sure they sell tampons on Earth.