starting birth control mid cycle?

nica
okay, so i just got put on the pill 3 days ago and i took it the afternoon i got it, the morning after that day, and this morning. im not suppose to get my period for another 5 days, but my doctor just suggested that i start it already. i was just wondering if because i started the pill before i started my period, will throw my period off or make it skip? and if i do start it while im on the pill do i continue to take them? im so confused!!