My periods are irregular and usually delayed for max a week. But this time it was delayed for 12 days. For which I took 3-4 days in between Norethisterone 5mg twice a day beacuse i ws travelling. It's said that it should start once the medi is stopped. But it took almost 3 days to get my periods. However since 3-4 months it doesn't bleed for a week(usual) but only a day or two. I missed my periods last month. And now the bleeding was only for half a day following spotting. I am 22 yrs.