Hi im a qualified hairdresser and bleach is highly toxic. I would say wait till you're 12 weeks because there's a lower risk of it affecting the baby. And also if possible avoid the scalp to avoid. The only 100% safe hair dye during pregnancy are semi permanent colours. Hope i helped xx
Oh and if you do it make sure to protect your skin to the max...
Thanks for your help, ill hold off until 12 weeks, wouldnt want any risk x