What cuases slight anal and vag itch and irritation and increased urination while on your period ? still a virgin never had vag, anal or oral sex

Could be anything: But, if you use sanitary napkins, you may have a slight allergy to the material, need to change it more often or not use any feminine deodorant products, etc. Even with tampons, it could be a mild sensitivity to products you use. As long as it's only slight, try not to worry and experiment with not using certain products. Wash gently with warm water and/or mild baby oil. Wear only cotton panties.