Having large clots during period, how do I know if something's wrong or it is normal?

No, U Have Options. Depends on cause of heavy bleeding. Need evaluation and sonogram. Non-surgical options include: birth control pills. Lysteda (non-hormonal rx taken during period), Mirena (levonorgestrel) iud. Minimally invasive options: endometrial ablation (in-office), hysteroscopy polyp removal or fibroid resection; and only if these treatments fail then consider hysterectomy - vaginal or laparoscopic if possible.