Can I Take Primolut N To Delay My Period After Using Meprate For 4 Days?

Hai, I took meprate tablet for 4days and i stopped..now its 6days over but i didnt get my periods..Having a temple function on coming thursday and i am much worried if i will get periods after tomorrow.. Can i have primolut n tablet to delay periods?? Whether periods will delay if i take that?