Pregnancy dry scalp... help

So I'm in the third trimester now and have struggled with flakes / dry scalp since my first trimester. I've tried natural remedies like lemon juice, or coconut oil and it does not seem to help. I have also tried head and shoulders which helps but doesn't make it go away. I'm open to any suggestions. Oh and I haven't changed my diet or anything and I do stay hydrated plenty, as well as taking my pre- natals.