I would say just wait on the probiotics until you are done cleansing.
Probiotics are "good" bacteria that are supposed to be in everyone's gut. Problems with the correct balance of "good" and "bad" gut bacteria levels is when the "bad" outnumber the "good".
Essentially, HUMAWORM cleans out ALL bacteria from the gut - so it can re-set itself to the proper levels.
The body grabs onto the right amount of bacteria and yeasts from the foods we eat and will readjust itself very very quickly.
This being said - you may or may not need to supplement with probiotics after HUMAWORM. Your digestion will be the deciding factor. If you are having good bowel movements - then the bacteria and yeast levels are correct - no need to do more :)