Dry scalp

Never had this problem before my son but when ingot pregnant my skin and scalp got super dry and has stayed that way postpartum. I use oil, moisturizers, and dandruff shampoo and it seemed to help. Now pregnant with #2 and its gotten exponentially worse. Constantly see chunk of dandruff and always have dry skin no matter how many oils and creams I use. The skin issue i can deal with, but the dry scalp and dandruff is driving me insane? Any remedies or scalp treatments that you can recommend that are pregnancy safe?