How Safe Is Taking Utovlan To Delay Periods?

I ve been taking Utovlan for 5 days to delay my period whilst on holiday. I ve taken the usual delaying dose 3 tablets a day and they are the same brand of pills I always take too. Just before I began taking the pills my period began and immediately began to take them. My period still hasn t stopped but is lighter than usual. Why hasn t it stopped? Is there anything I can do?