Bra-who to ask- please help :)?

i live with my dad my step mum, my older sister(6-libby), my little brother (harvey-4), my older brother (jack-16) and my older sister (emily-18), mum died a couple of years a go. anyway i am 13 and i when i got home from school earlier i found out i had started my period, but my step-mum is working away for the week/end and my older sister is on vacation, so it is just me, my dad, my older and younger brothers and my younger sister. so i dont no who to talk to about getting pads or anything. i am abit scared about talking to anyone- what should i do ? please help :) x