White dot on baby’s heart

Amy • Married❤️ mommy of 👦🏻👼🏻👼🏻 baby #2 due November 2019

So the dr told me that they found a white spot on my daughters heart which is a sign of Down’s syndrome at our anatomy scan . We had the genetic blood test done at 12 weeks and everything was normal. She is sending me for another ultrasound to be sure, she doesn’t seem worried since everything else looks perfect. Has this happened to anyone ?!

Ps she is sucking her thumb 💗