I started taking Yasmin birth control the Sunday after my period was over?

, but now I realized that my period started on a Saturday and I didn't start my pills the next day which wouldve been a Sunday, I started my pills the Sunday after my period was over...Is that going to be a problem? (I'm out of the US right now and just simply went to a pharmacy and bought my pills, so I have no ob/gyn) Will the birth control not be effective?