Blood Rune?

Original water color by Ingrid

There are rune beings closely woven together with earth, air, water, fire. Who is the rune being most closely connected to the blood of women, menstrual blood? It is through this mystery we all come into life. Has the existence of this rune, its shape and form been forgotten or hidden?
Blood moves through all of us.
We have a certain fascination with the blood of warriors, battle, and death.
We are entertained by tales of hungry vampires drinking blood.
But what about the life blood that flows each month from women’s bodies? It is a connection we all share, yet we hide it, ignore it, or pretend it isn't there.
Surely there is a rune for women's blood, a rune that connects us with this potent, primal being, giantess, goddess, that cannot be ignored and does not go away. She is intimately connected to life and death.
The runes are numberless, not limited to the few popular ones we know. What shape and form does the rune of women's blood take?