Thanks for your query,
Most common cause of this type of presentation is PCOS
. IF your periods were very irregular from the begining and you are obese
, then chances of PCOS is high . However there are many other causes also . It is important for you being investigated , so that cause could be known and properly treated. You will be given progesterone
for few days to see whether you are having withdrawl bleeding with progesterone or not.
Best of luck and take care..
Hope it helps you..