I have hypothyroid since 5years. i am using thyronorm 50mg pills so the TSH levels is in normal range. But still my peroids are irregular. I am sexually active. The peroid was late for almost 20days. I consulted doctor, he said I am not pregnant and the periods may be delayed for few days as I am sexually active and I had hypothyroid. Can you tell me what the reason was? My health is absolutely fine and no other issues.