Echogenic focus in babies heart?!

Andrea 🎀 • 24 yr old stay at home mommy to my one year old son and wife of 5yrs to my hubby. Baby #2 girl being induced Feb 14th!❤️
My midwife contacted me to tell me that she found something called "echogenic focus" in my babies heart (left side). Should I be worried or is this common? What exactly is this?! I'm so worried for my little girl. I'm currently 22 weeks pregnant. Some people say it goes away in the third trimester? Help please. So worried! 
I will add that I did a blood test at 12 weeks and 3 days and I was low risk for everything.

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