Re: when?

Hi, I'm into my 3rd week of Parastroy and aside from just having very productive BM's, I haven't seen anything except one little noodle like strand that someone said it is probely a threadworm. It says to stop after 3 weeks and if necessary, restart in a month. How do I know if it's necessary? If I start seeing things close to the end, shouldn't I continue with out stopping? I don't want to kill them 1/2 way....I want them all the way out!!! Any suggestions?