[Eagle27]

I don't think the blood goes to the breasts instead of going down, but I think massage affects periods cause it stimulate hormone production.

I found this very interesting: http://www.breastnotes.com/breastfeeding/BrFd-ReLac-StoppingPeriods.htm

IMHO, losing less blood during period is a (really nice) side effect of massage, that demonstrates your body is responding well to what you're doing.

Good luck!