Unusual heavy bleeding

Patient: Ok, i have been on the 3 year birth control the implanon, for 2 years now. It always makes me bleed longer than usual,but for the past 3 days now i am bleeding extremely heavy. Huge clots,and even more than my urine. Is this normal,or should i go to the hospital? I have never bled this heavy in my life,not even when i had a miscarrige. i am worried.