Possible Coarcation of Aorta (30 year old) but echo showed nothing abnormal?

Hi! I am 30, 5 foot 4 and 122 lbs. I have had high BP since I can remember and currently on labetasol (spelling).  I have a cardiologist now and he couldn’t find a pulse in my foot for a long time and thinks I have CoA...the echo came back normal. My resting bp is usually 157/103 which is insane...can other tests show this? Or do I not have it? Right now I’m feeling short of breath but no other real symptoms except my leg hurts sometimes...I just feel like my bp has been minimized and now I need answers! Thanks!