Thanks for the query.
I understand your concern.
Irregularities in menstrual cycles can occur due to many causes like lifestyle modifications, stress and strain, polycystic ovary disease etc leading to gonadal hormonal imbalance, thyroid hormonal imbalance, prolactin level changes etc.
As you didn't get periods since five months better to get evaluated to find out the possible cause of delayed periods and to rule out pregnancy.
So, please do consult your doctor, get examined and go for investigations like ultrasound, gonadal hormonal profile, thyroid hormonal profile, prolactin levels, hemoglobin and blood sugar levels estimation etc.
With this workup the possible cause of your problem can be identified and treated.
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