I'm about 2 1/2 weeks into my first HW. I was worried about "slowness" as well but not because I'm doing a heavy metal cleanse. Instead it was because I'd never done anything like HW and was worried about things slowing down and making potential die-off worse. However, I decided to combine Humaworm with Humacleanse (the colon cleanse) and that combo has kept things moving properly (and better than before) so you might try that.