Hi Anonymous and thanks for bringing your concerns to the EmpowHER community.
Having a period twice a month is abnormal and you should see your doctor right away because you may become anemic if this continues. It is hard to know what is causing this. It could be a sign of infection or other medical problem that would need treatment.
Please see this article for more information: Reasons for having a period every two weeks.
Hope that helps and you will let us know what you learn when you see your doctor.