Welcome to HCM,
Oral contraceptives are hormonal
These can cause menstrual irregularities.
As you are bleeding for more than 11 days, please consult your Gynecologist.
Meanwhile you can take Tab. Mefenamic acid
and Tranexamic acid
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Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma