I guess you may be parasite free, but why did you start a cleanse in the 1st place...?
It is possible that your dosage is ineffective, or you're taking a low potency product.
If you suspected a problem to begin with, you may want to try different products, and include in your diet foods which work against parasites.For example,raw pumpkin seeds, garlic, cayenne,cumin, ginger,onions, papaya seeds, jalapeno seeds, etc.
I don't know what you're using, but there are many herbs you can try: oil of oregano, olive leaf extract caps, myrrh, cayenne tincture(10000HU),etc.
Don't get discouraged, be patient.