My guess is that your body is working on something in the stomach right now.
Could call it healing pains.
Unless your just not getting adequate water intake.
If you continue the fast till a distinct feeling of natural hunger comes over you, then you will have completed all the detoxing that is possible for this fast.
This will happen when either your body has used up all its nutritional reserves or the body has completed its work of cleaning, rebuilding etc. Whichever comes first.
It could be that the body has finished its work. I suspect that you would really feel it if that happens.
It would probably feel like you have a new body. Which would pretty much be the case.