Hi Doctor My Last Period Was March 26, 2016. But

hi doctor my last period was march 26, 2016. but still now i have not get periods, i have checked pregnancy test its negative. i consulted with doctor she said i have thyroid. i took thyroid and getting period tablets from one week. even though i am not getting periods. i am one year old married girl. trying for pregnancy from past six months but i am not getting pregnancy. please help me in this case