Birth control?!

Maggie • love yourself😘
Hey ladies, I've a got a question! I'm starting my birth control tonight, but the directions are very confusing and my doctors office is closed. 
My doctor instructed me to take it the day I start my period, which is today, but on the pack it has the sun, mon, tues, wed, thurs, fri, sat. When I take the first pill, do I take it on the one labeled Thursday? Or start with the Sunday pill?