HI Doctor. I Have Been On Nordette And Oralcon For

HI doctor. I have been on Nordette and Oralcon for about a year now but the pharmacist gave me Trigestrel and i'm not sure how to use it. I just finished my period so does this mean I have to wait for my next period before I use Trigestrel or can I use it so long? thank you so much for your advice!