Home box dye (I NEED HELP)

Alright ladies, I need help. 
Before I got pregnant I decided to dye my hair, hated it from the start, then found out about a month later that I was pregnant. I have read that it is better to wait until after your first trimester (12 weeks) to dye your hair. So, I have waiting a whole 11 weeks! I will be 12 weeks on Friday. My question is, I have a HUGE work meeting in two days and wondering if it is close enough that I could safely die my hair? I can't stand the color plus the huge amount of re-growth. But, I don't want to harm my baby, obviously. 
I need advice! Comment too if you have a different opinion than the options.
I'm also going dark all over color so I'm not going in to pay $150 when I can pay $8 and get the same result. (I know you hair stylists will hate me) 

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