It is important to be your own best cheerleader and if you still have that in you, I would say, go team go, and forge ahead. If you do feel done after caving in, you may consider doing the cleanse until you are breaking on a *high* where the current load of toxins has been flushed out, and you will not suffer the effects of quitting on a low.
Whatever you decide, you can always do more cleanses, AND if you keep on keeping on, there are going to be more people coming on board starting this week.