My dad Never Stops Asking me about my period? how can i make him stop!!?

Ive Had my period Since i was 11, im 14 now, And last year my mum must have told my dad i had my period, Because every month He'd Ask Me ''what week is your period hunni' And then when im on my period He'd Ask My about 8 times a day If im feeling ok, do i have period cramps, Do i need tampons, Or if im in the toilet he'd come down to the door knock and ask me If i need anything and if im okay?, its really annoying me lately because i can handle it myself now, And He treats Me Like Im really sick or something everytime im on it, What can i do to shut him up?