Suspecting a heart vessel defect

Catherine
Has anyone had an ultrasound and they told u they think your baby's aorta may have a "defect"?I went in for a fetal wellness check coz my platelets r low,and all of a sudden this😲;my question is, they have been monitoring baby's heart rate,wouldn't they notice if there was a circulatory issue?I am 35wks along,I have had 4 ultrasounds already,this last one included,they just noticed this "suspicious" issue now...I am freaking out right now,worrying...I have an appt with a pediatric cardiologist next wk for a fetal echocardiogram....requesting prayers🙇