Hi, Yes, you can do hair treatments while you are pregnant but it is safe not to use chemical based products, and it goes fair for everyone whether they are pregnant or not. You can even go for highlights, hair dyes provided they are not done from the roots and the hair dyes are pure vegetable dyes.
Can use product that can use for pregnant women
Can but avoid chemically laden products
Yes, protein hair treatment is fine.
Yes I do mine too
Yes you can.