Hi thanks for your question.
One impotant thing you should remimber that unwanted 72 is not used for regular contraception
.It is used only for emergency purposes.Since you have taken emergency contraception after every exual act,chances of pregnancy
are very less.Delayed periods could be due to hormonal
imbalance which you created in your body due to 5 doses of unwanted 72 in one month.Get you pregnancy test done to rule out pregnancy ,(though chances of which are very less).Hopefully your periods will starts in few days.
Hope this answers your question.