Have you or will you get 3D ultrasound?

Ive been reading up on this and debating now whether I want to move forward with getting a 3D ultrasound. They say it's unconfirmed but could cause risks to your baby such as link to childhood cancers, and issues with brain development. And that certain parts of the technology is similar to CT scans. I know it's unconfirmed and could be crap but not sure if I wanna take the risk just to see baby an extra time. 

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