I won't chance it. You could get an infection. The ink gets into your blood stream and will go to the baby. It's worth it to wait.
A reputable tattoo shop will not tattoo you while pregnant. It's unsafe, if they aren't the cleanest or do something wrong you can get very ill and risk your babies health.
I would say to wait. The doctors also say no. Why take a risk of something happening to the baby if you can get it done in 7 months? I would just wait.
I had a perfectly healthy son and on baby #2
They say not to. Im being honest I got 2 in my first trimester