I had blood in my stool and so was sent for a flexible sigmoidoscopy. They found a few small hemmorhoids and a small polyp and one large polyp which almost entirely blocked the colon. The endoscopist stopped the procedure as he couldn’t get the scope past it and I will be going back ASAP for a full colonoscopy plus some additional blood tests. He mentioned it was at least 3cm wide. It was bright red and angry looking and there was a lot of blood visible on screen

My question is what will happen next? Is it likely to be malignant? Does having these two mean there may be more further up the colon? 

I’m a bit shocked by the finding so any advice would be great. Thanks!