I am 29, I have hypothyroidism since 2011. I been taking levothyroxine medication all these years my last dosage was 125mg .I have returned to India last march , after consultations with an ENT I have started new thyroid tablets of 150 mg. I am due for my periods 10 days ago still no sign of it . I am bit concerned as I never had problem with my cycle. Is this tablets has side effects . What can I do ?