Hi, My Periods Were Due On 28th And I Wanted

Hi, my periods were due on 28th and I wanted to delay my periods for a vacation. I started taking devilry 10 mg from 25th twice a day. Today is 27th and I had some bleeding today. What can I do now as I really want to stop the periods. I did take the medicine roughly on the same time except yesterday night while travelling I got delayed by about 2 hours. Please help