osal
my sense is that this is not such a big concern. *No slight intended. I think the poster may have overreacted...On the MC, you can indeed pass some 'sand' as it cleans the kideneys, the liver, and indeed all bodily systems. There may even be small masses that release themselves, and there might be a touch of blood with that.
This ( situation) is why it helps to see the body as a whole, intricate unit, with its own innate intelligence, before going into the MC. To trust. Plenty of things happen. I hope the poster finds that balance again of trusting to Grace. I truly don't see how the
Master-Cleanse done correctly can cause anything serious -- while it definitely can undo plenty. So-- and the undoing might include a few moments of shock.
Breathe deeply.
Best
Osal.
P>S> so, was there really any significant amoount of blood, or was it just a tinge?
Could have been you passed a kidney stone, or some 'gravel'. If so, good.
Drink water and carry on. Center yourself. Of course, you will have to go with your (highest) intuition.