Take time during your period to be in nature and mediate.  

Take a bush walk, sit on the earth and bleed or bathe in your local awa or moana (river or ocean)

Some iwi do not believe in bathing during their ikura but most have always used the awa or moana as a rongoa during a period  

Our ancestors used their intuition on whether it felt right or safe to bathe in a particular spot mostly keeping to their own awa or moana.