I wouldn't risk it. I've known a few pregnant women who've ended up with unexpected colors when hoping to go blonde (even if they were already blonde) - something to do with hormones I think.
I've heard a lot of varying thoughts on colouring your hair while pregnant. Personally i have done it... but not as frequently as when I am not pregnant. I usually dye my hair once a month... but that might be too frequent when pregnant. How fast does your hair grow (it usually grows faster when pregnant i think).
I've recently gone darker... I was gradually going lighter from a dark brown... but it got to a point that it didn't seem to suit me... so all of a sudden I went back to the darkest (nearly black) shade of brown that I was when i was younger. My eye brows and lashes are black anyhow so it suits. My skin is quite fair.
I say be brave, it's only hair, but just be wary of colouring it too frequently when pregnant.
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