DAX formula help

Hello guys. I´m facing a problem in power bi. 
I have a slicer with  dates (starting each on Mondays - eg. 06-05, 13-05, ...) and i want to personalize my Collunm Chart with the previous 6 weeks when i select a date. (eg. When i select Week 7, it will show on X axys the Week 2,3,4,5,6,7)
Can u help me with some Dax function to put this work?