please help

Today we had our 20 week ultrasound. Upon scanning over baby boy, our Mfm specialist decided to refer us to Boston Children's Hospital to see a fetal cardiologist because she thinks the right side of baby's heart is smaller than the left. Told us it could be a number of reasons, even being that the baby was in a funny position. Has this happened to any of you and has anyone been told this and had it be nothing at all? All I've read is about different heart issues and surgeries and I'm terrified for our baby. Doc even told me that if I got bad news I can still terminate the pregnancy up till 24 weeks. I'm going insane trying to tell myself it will be fine. Prayers for us please🙏🤞