Get yourself to your gp hun asap. I had the same thing happen when I had implanon out. I bleed so bad, huge clots the size of tennis balls and was soaking through everything in like an hour. One morning I stood up and it GUSHED like you describe, down my legs and all over the floor. I was so weak and tired and felt light headed. Doc put me on 'Cyklokapron' or tranexamic acid tablets to slow the flow. They are used post op to stop bleeding. And they work after about 24 hours.

Big hugs hun I know how scary it is to be bleeding that much.xo

p.s forgot to mention I had implanon out last april and only now have my periods gone back to normal. I had to keep getting new scripts for the tranexamic acid tablets for ages after. I also went for an ultrasound which showed my uterus and lining etc was all completly normal, which means it was all the implanon removal that stuffed me up!