Creating Trend comparing current week with previous week

harirao  I'm assuming you have a DimDate table?? 

If not, get one, they make a big difference:

https://excelwithallison.blogspot.com/2020/04/dimdate-what-why-and-how.html

Once you have the date table, I would consider a slightly different approach to this problem, using time intelligence to change the filter context within the measure, rather than creating a calculated column for previous period. 

So something like: 

harirao , refer to my blog on how to work with the week; this week vs last week etc.

https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-Last-Week/ba-p/1051123

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi
https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/

See if my webinar on Time Intelligence can help: https://community.powerbi.com/t5/Webinars-and-Video-Gallery/PowerBI-Time-Intelligence-Calendar-WTD-YTD-LYTD-Week-Over-Week/m-p/1051626#M184


Appreciate your Kudos.