I got thyroid detected after 8 months of my delivery and I started taking medication for it. .and it came back to normal. .i still hv those tablets daily.. now it's been one year 2 months.. I never noticed missed periods ..my date is 7th of every month. .today is 18th I still did not get my chums....is there any reason to worry.. I did not have any physical relationship with my husband. .