I appreicate the inputs.

I will drive the mosfet with PWM.
Thus, if I put a resistor to lower side, PWM will not be as good ( I think).
This is why I am trying to read the current on upper side.

Also, if I put ADC Vref(-) pin to Point B (on schematic), ADC input pin to Point A, how do I set up Vref(+)?