My doctor brought up Down syndrome

Hello everyone. I just had my 20 wks scan today. I am 19 wks 6 days today but baby is measuring 20 wks 3 days. I took the blood test to test for Down syndrome like 2 wks ago and it came back negative. However on the scan today they noticed a spec on her heart that is most common in Down syndrome babies so I'm being sent to a specialist for further in depth ultra sound. This is my second child I have a 2yr old son who is perfectly healthy. Y'all I love my kids and this baby is a blessing already. Down syndrome or not Her dad and I will love her unconditionally! I just want to know if anyone has ever had this and was it nothing or did your baby get diagnosed with downs? Thanks a bunch!