heart murmur

anyones newborn baby had a heart murmur? she’s 4 weeks old. I took my baby to the doctor bc her breathing is just off and she was seeing someone else. the previous doctor referred her to a cardiologist but the appointment is a month out. her new pedi instantly picked up her murmur and sounded concerned so he got her into the cardiologist today to have a scan of her heart. im a little worried. she retracts as well.. I know they say murmurs can close on their own but I need some type of encouragement 😕