I was 22 days late for my period, then on Feb 6th i got it. It lasted 16 days until my doctor put me on a hormone medication to stop my period. It stopped for 6 days and it has started again. What is happening? My doctor doesn't seem to fazed despite my worries about it. Other info: I have a slight thyroid problem where my thyroid levels fluctuate between under active and normal. I am taking thyroxine. I am not sexually active either.