Silly question, but i need to get a cbc but i am on my period. should i wait until i am off or will it not affect the results?

Menstrual flow consists of the breakdown products of the womb lining. Although this has a very bloody consistency it is not active blood loss as might come from an injury. Having a CBC during menses will not be adversely affected. It will represent your current internal systems blood load. Menstrual blood/iron loss over time can produce anemia & benefits from regular use of an iron supplement.