I have been on my period for 2 weeks and has lots of clotting, not on birth control. what is the problem?

Hormone abnormality: If you're not pregnant, the most likely reason for prolonged, irregular bleeding is hormonal problems. Thyroid disorder, polycystic ovary syndrome, or others can lead to such bleeding. Less common reasons could be uterine fibroids, cervical infections, or others. Some blood tests would likely give the answer. Good luck.

Not Normal!: It is common for young women to have irregular menstrual cycles: have their periods last longer, come late or miss them all together. However, a period that is lasting for over 2 wks is not normal. It can lead to anemia (low blood count) and should be evaluated by a clinician asap. Your workup will depend on how old you are, other history, and findings on initial physical exam.