It is not recommended or necessary to do a test after the second dose of a treatment for worms. As long as you have taken the necessary steps to prevent reinfection and have completed the full treatment course, the risk of reinfection is low. The medication you received may immobilize the worms, but the body will eventually eliminate them through bowel movements. It is normal to still see worms in stools a few days after the second dose. If you are concerned about the effectiveness of the treatment, you can use a flashlight test or consult a doctor for further examination. Remember to watch for symptoms such as anal itching, as scratching can cause further irritation.