It probably won't harm anything, but why risk it? And also you would have to lie on the consent form because any tattoo place would not tattoo you knowing you're pregnant and that is something they ask on it. I completely understand the one year sober thing, I'm in the same boat... But you can get it done afterwords too, much less harm for the baby. Baby should be first on your mind right now, not tattoos that could potentially harm your baby....