Question: The Pill

My doctor put me on Yaz (the contraceptive) and he wasn't very clear on when I need to start the course since it's my first time ever being on the pill. The instructions on the leaflet states that I need to take my first pill on the same day I begin my cycle. The only thing I'm unclear on is: The grey area on the tablets indicate on need to start on that week. So if I begin my cycle on a Wednesday and that falls halfway along the line of the grey pills - do I stick with the days of the week? I'm so confused and the leaflet is just way too confusing for me.