Hello dear  , welcome to practo.com .in 3 to 5 percent cases of pregnancy there is mineralization in heart muscles and calcium deposited seen ,this does not cause any health issues.nothing  to worry.

You should not worry about this (single echogenic focus). Firstly no action is indicated at present. Secondly the finding may not be there in the next scan. Thirdly you only have to tell the Paediatrician at the time of childbirth that this finding was there during a routine scan. His next action will also start 3-4 days after the childbirth. Theoretically it is one of the soft markers for foetal anomaly. I suppose this is a small price you have to pay for advances in technology.

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Echogenic foci is found in 8 percent of Asian population without any risk Still u need to get fetal echo at 22-24weeks

You need further test called fetal echo between 22 to 24 weeks