Hi there
May we ask how old you are?
This is definitely not normal for menstrual cycles.
Please know that I am not a doctor or a gynecologist.
One possibility that comes to mind is polycystic ovary syndrome. Some young women develop this syndrome and it greatly disrupts the menstrual cycle. Birth control pills can help regulate your period if this is the case.
However, there can be other reasons for your irregular periods and so my best suggestion for you is to be seen by your doctor or gynecologist. Bleeding for an entire month can cause anemia. You really need to be seen by a physician.
Thank you for your question.
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I am 17 years old