Experiences with Maternal Fetal Medicine Specialist

We had to do another ultrasound today (24w 5d) bc our little guy was too active at 20w apt to get the 4-chambers of his heart... today he was corporative with us & we got what we needed... to find out that on Wednesday we will need to see a MFM Specialist- they said don’t be too worried yet- this is common, but one of his ventricles is looking small? Anyone been through this? All tests and labs are great... would love experience , strength, and hope! Thank you