Ultra sonogram safety in early pregnancy

Good morning everyone

My last US scan was at 8 weeks pregnancy, the doctor gave me appointment for 10th of June at 16 weeks, but i just read that for Nuchal translucency you should do US at 12 weeks, should I go back for another one at 12 weeks or just wait until 16 weeks ?

I have done three US so far so I am afraid if do it at 12 weeks it will harm the baby.