I am 45. For the last one-and-half years many a times my periods were getting delayed by 10-15 days, if not every time. This time it is already more than 3 months delayed. Local gynaecologist has given me Trito-N (Norethisterone 5mg) 2 tablets per day for 5 days. Please advise. By the way, I have hypothyroidism for over last 14 years.