WHY IS MY HAIR THIS WAY

I generally have very oily hair it'll get greasy super quick but man. I'll wash my hair and the next day it's oily and I can't use dry shampoo because my hair is dirty blonde root and washed out red beyond that so there's no colour to match and normal white dry shampoo just makes me look like I have serious dandruff. Anyone else got really oily/greasy hair since pregnant? Damn.