I had cervical polyp removed today, after few hours ,my bleeding is extremely heavy, big amount of blood! i am so scared, is it normal or not? thx

Not normal: It might be expected, but call your gynecologist who would know details of your case and might recommend follow up or ER evaluation

See Clinician ASAP: Cervical polyps are usually benign vascular growths, which can cause spotting or bleeding. They are relatively easy to remove in an office procedure, but the base can start bleeding if the scab is disrupted. Given your heavy bleeding, I would see your clinician asap, so they can stop the bleeding with simple procedure. In the meantime, try putting large tampon up against cervix, but not >24hrs.