Can I Continue Taking Primolut-N To Delay My Period If I’ve Started Light Pink Discharge?

I had my last period on 25 th Dec. my period cycle is 26 days or at times 28days. Now I want to delay my periods upto 28 th January,2023 as I have travel. Today ie on 18th January I took Primolut N but by evening I am seeing light pink watery discharge.I am taking Primolut N since from last 25 years . Now please advice what to do should I continue with the tablet ? Will the continuation of the tablet will stop the pink discharge