PLEASE HELP ME!!!!daughter with asd and ps?

I have a six month old daughter who has asd- atrial septal defect and ps pulmonary stenosis. she was born with both heart defects. she is scheduled to have a heart cath on july 8 of this year. What can i expect after her heart cath???? S he is now retaining fluid in her feet and they are swollen. Do i need to take her for another check up or just wait until her surgery??? im so scared and worried about my baby now at this point.