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If you have not had periods for 2 months and even the blood test
for Beta HcG
is normal saying that you are not pregnant then surely you are not pregnant.The irregularity in periods can be due to other causes like:- hormonal
imbalance ;ovarian cyst
and even anaemia so it will be better to consult a doctor than worry about it.Please consult and get examined by a Gynaecologist and he/she will treat you accordingly.