You can do it, just be prepared to be extra-tired as your body is already "cleansing" and you'll be putting an extra load on it by flushing.

I did it right before my period (I think it brought it on early) and it went fine but I was exhausted and had very heavy bleeding.

I posted on the Ask Andreas Forum and he said the heaviness was normal as the body is using the menstrual blood as a means of eliminating toxins.

Good luck.

I did my most recent flush while right in the middle of my period. There were no ill efects for me, except, perhaps, the annoyance factor relating to having to deal with THAT at the same time as many trips to the bathroom. I won't go into more detail than that as don't want to gross anyone out....

I also agree with the above post. Especially the part about eliminating toxins. I may go as far to say as since my body was already in the phase of toxin elimination through blood, it may have even helped! just a theory.

Blessings,

Ali