When do you get your period on the pill?

Katie
I just got my period this evening and I took my first pill. It's called Microlite and it's a combination pill. It's 21 days an a 7 day blank week. In the 7 day blank week, will my period start on day 1 or during the week? I really don't want to get my period on a Friday every month for the foreseeable future 😁