Please help me with this situation, again?

It could be from eating all that fiber, if you're not used to eating that much. I don't think it's related to cancer though. If it continues for a day or two, go see your doc for a stool sample. I've had one for pretty much the same thing and it was fast, painless and ended up negative. You may have just ate something with artificial coloring or the high fiber did it..good luck, hope it's nothing serious.