hi, off to Thailand on 5th feb, im 47, after always having regular, easy periods, over the last 12 months they have got irregular, and my last one, ending today lasted 9 days with bright red blood ( not heavy). Would like to miss one if poss, off on a holiday of a life time, and concerned. googled norethisterone, not concerned about the messing with time bon my cycle on my return, just side effects whilst away, mainly bloating, nausea??