Hello doc..I am 33 years of age having a weight of 49kgs. I've visited my OB on the second day of my menstruation. After having my ultrasound test, she told me that she will be gone for weeks and she will not be able to see me during my ovulation period. So she advised me to take duphaston (10mg) 2 times a day for 15 days and I will have my mentruation again..But today, it's already on my 20th day and still I have no mentruation. Can you please enlighten me why is this so? Just to add information, I missed 3 tabs during those 15days. Thank you so much. Regards.