Thanks for your query.
First trimester screening cannot identify the limb anomalies and cardiac anomalies well.
Cardiac function is best evaluated in the second trimester.
I understand your concern just perfectly.
However, not all syndromes are hereditary.
Some anomalies ( for eg. the cardiac one your baby is having ) are found more commonly in some syndromes, but that is not a necessity.
AM sure the donor report was well screened.
Also, pulmonary stenosis
, if confirmed,is life threatening , and you should consider termination.
Please upload the entire ultrasound
report to me at -