Hi Sir, I M Parul.. Sir I Always Get Late

hi sir, i m parul.. sir i always get late my periods approx 15 days.. i m unmerried 34 years age. and i have thyroid.. problm.. last 3 months ago it was 10 my thyroid.. doctor suggest me eltroxin.. and after taking one months eltroxin.. my period became normal... and then i count"nt take eltroxin from one month.. and again i hv problm.. my last menses time was17 mar.. and i dont get menses... plz suggest me any tablet to regularize my periods.. i want it today or tomorrow my menses