Ultrasound- white dot on babies heart

Raven • 💙 My prince 👑 was born Feb. 2021! We are excited to be welcoming baby #2 in Dec. 2024! 💙 IG: Ravenmulan

Has anyone been told that there was a white dot found on the babies heart during a ultrasound?

Doc referred me to a specialist. Is this normal?

I’m worried as they said it could be the first sign of Down syndrome or it could be nothing. but we did genetic testing and he was all negative for downs and he is measuring everywhere else perfectly. No other signs of downs. Thoughts?