When Do I Need To Start Second Pack Of Krimson Medicine?

Hello sir i am suffering from PCOD. my doc gave me Krimson 35 for 3 months. she told to take pill from the first day of my cycle. i already finished my first pack and after 4days my period started. now from when i have to start my second pack from first day or after giving a 7 days gap as per instructions given on pills packet.plz reply thanks