I had my periods on 25 th sept bt it did nt happen the next month. I waited till november so tht it will happen bt did nt happen . I had sex on november 11 th n took an I pill within 5 hrs for safety. N later after 3 days I took harmonal tablets ( sandoz) for periods to happen. I took a five days course n waited for two mr days bt it did nt start.. I am worried. wht shud I do fr my periods to strt.