Heart murmur?

So my baby was born at 32+5 weeks and she was only feeding growing and came home in 16 days. She’s 7 months now and at her checkup they noticed a heart murmur and they referred us to a cardiologist. This wasn’t mentioned before so I’m assuming it’s a new development??

I’m extremely nervous and super anxious does anyone have any insight on what could be going on? The doctor said that premie babies have higher risk for congenital heart disease so now I’m absolutely terrified.