Do a good parasite cleanse for at least 30 days before you decide you don't have parasites. In a good parasite protocol, you should be doing something to destroy the biofilm. It is probably then digested by the acids in the intestines. That can happen to the parasites also. You may only find vague skin like things. That is digested parasites.
The real test is whether you feel better, not the quantity of feces. Add ground flax seed ( about 2 tablespoons) to a smoothie. It will bulk up your feces and help move them along. And water. Plenty of water.