I would wait. Like the lady's above said, high risk for infection and etc.
There is a reason they won't tattoo pregnant women. Did you think about that before asking this question?
Tattoos And Piercings Are No No. Higher Risk Of Infection, And Ink Poisoning. You Probably Won't Listen To Any Of Us. But If You End Up Getting One And Something Happens Don't Come Crying Because You Made An Idiotic Decision
Are you kidding me?! DO NOT PUT YOUR CHILD AT RISK BC YOU WANT A TATTOO!! I have 7 and was planning on finishing my half sleeve before I found out I was pregnant but guess what, when you're having a child and they're growing inside you, you out their wants and needs before yours meaning no tattoos! That would be one of the most selfish things you could ever do. Seriously.
Just because they don't know doesn't mean you should. You will be risking a possible infection which could cause you to miscarry. I've had a miscarriage before, it was the worst thing that has ever happened to me, and I wouldn't wish it on anyone.