Hello .. Thanks for writing us
You sufferred from peripartum cardiomyopathy
that is reversible in around 33% case, you were lucky that you are normal now.
This flutterring below rib cage
looks like non cardiac but to be doubly sure you get one ECG done whenever you are having symptom or one Holter monitoring that records 24 hrs ECG recording
Get back with report , I will be happy to answer