definately ok, the only issue is the condition of ur hair during pregnancy, some people get glossy well conditioned hair whilst some get really dry, brittle and even have hair loss...there is no risk of the chemical going through your skin to ur baby, but be careful if you hair has gone dry, .... I have home coloured, and permed my hair at home during april (2 wks apart), and after both my hair is still in good condition, i am also prematurely quite grey, and was no longer in the mood for sitting every morning, trying to tame my wavy thick hair with straighteners, lol... the thought of giving birth lookikg like a skunk {brown hair with snow white roots) that would probably be about 3 or 4 inches long if i waited 9 mths to colour was a scary one .. so after going into literally every hairdresser where i live for advise, it was confirmed that it really is an old wives tale !!