I'm 17 weeks pregnant and my 17 weeks us is foetal heart ecogenic foci in left ventricle seen tiny bright spot. Please suggest

This is really a question for your own medical practitioner.

There may not be any problem at all with seeing this, but it most likely will lead your doctor to want to have some further testing done to know for certain.

What did your doctor say would be the next step? A higher level ultrasound? Possible amniocentesis done?