Anatomy scan (EIF)

So i had my anatomy scan done monday and i was 19 weeks & 4 days. The ultrasound lady and doctor said she was growing good and everything is looking healthy and where it needs to be. But the ultrasound lady found a small bright light on her heart in the Muscle. She has no abnormalities or anything. I already got the blood work done so I know its not down syndrome and the doctor said it wasnt that and that my baby is perfectly fine. It could be that her heart is so tiny considering that i was 19 weeks & 4 days. Has anyone ever had this experience and did it go away?