EIF anyone?

I just had my anatomy scan/gender ultrasound today. I’m 20 weeks and the doctor said everything looks good, however, there were some white spots he saw in the heart. He wasn’t concerned as he didn’t spot any other abnormalities. He did say though, that babies with Down Syndrome do have that abnormality. But again, he didn’t see anything else. Anyone going through this as well? Should I be too concerned? I have a follow up ultrasound in 4 weeks for a growth check.