What Causes Irregular Periods Even After Taking Medications?

after marriage i have irregular cycle i consult doctoer then i tested testosterone level is high 1.11 then i tool meperate for i monthand my pill tablet for 3 month and i have regular cyclefor 4 month after takin this tablet ovacare for 30 days and letoval2.5 mg for 3 days periods till 7th day .now i missed 50 days period i test urine pregancy kit for 41 day it show negative.