First period with BC

I started Birth Control on May 28 and, by regular schedule, I was due for my period on June 10th. It's almost been a week and I still haven't gotten it. I'm wondering if anyone knows how late BC delays first periods on and the pill. My last period day was the 17th of May and I understand you should start the pill the last day of the period but my doctor said to just start it the day I saw her so I'm all confused. Any info helps thanks!