I Am Using Qlaira Contraceptive Pill, My First Period After

I am using qlaira contraceptive pill, my first period after taking 26 tablets was very light, but in the second month of using them I got my period on day 20. Can you please tell me what should I do? Should I drink this pack until the last tablet or should I start using another pack... Today is my first day of new period, and I already drank tablet for day 20.