Color deppending previous week column

Hi quickbi ,
Yes you can achieve it by conditional formatting in PBI ,
I created a sample dataset and get this output ,

You can use this measure and the plot it in FX OF YOUR COLUMN OPT IN FORMAT OPT. 

Difference = 
VAR CurrentWeek = SELECTEDVALUE('DateTable'[WeekNoYear])
VAR CurrentWeekSales = CALCULATE(SUM('Order Data'[Sales]), 'DateTable'[WeekNoYear] = CurrentWeek)
VAR PreviousWeekSales = CALCULATE(SUM('Order Data'[Sales]), 'DateTable'[WeekNoYear] = CurrentWeek - 1)
RETURN 
IF(
    CurrentWeekSales - PreviousWeekSales >0 , 
    "green",
    "red"
)

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If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!