First time parents - Almost 21 weeks-Heart doc?? Contractions?

Kristin • 1st miracle baby due Christmas Eve 🎅🏼🍼👶🏼🎄😘
We had our 20 week sonogram and are now being sent to a pediatric cardiologist to check out her hurt because she has right ventricle wall thickening in her little heart....anyone else? 
The girl said I had a contraction or two and have Braxton Hicks?? I didn't feel it because I don't even feel her yet! But, isn't it too early for that? Hope that's normal but then again, who wants contractions throughout the whole pregnancy! Yikes!!