I am 22 years old I had thyroid and taking tab of 25 mg daily for hypothyroidism. I had an unprotected sex on 2 to 4 th april. And I expect periods on 9 th but I do not had I did pregnancy test several times it was negative. So I consult my doctor he did vaginal ultrasound and said I am not pregnant and ask me to take primolut I take it on 12 and 13 th april and had periods from 14 th till 18 th but it was not heavy bleeding .and this month too I did not had my periods yet so I consult Dr. Again after taking pregnancy test at home with kit available it was negative .dr again ask me to take vaginal ultrasound and said I have ammenhorea I am not pregnant and give me duphaston for 5 days*1 per 3 times in a day I started it from 21 may. I have no symptoms of period when should I get my periods? Is that I am pregnant I am too worried. My vaginal ultrasound shows endometrial thickness of 15 mm and everything is okay.