Laravel : How to get weekly report

I have database with created_at with timestamp type in a table..I want to find the weekly report where the user automatically load the page he will see current week saturday to friday data ..How to i implement that?

I used carbon to to get the today date and add 6 days with that

 $now = Carbon::now();
        $time= $now->addDays(6); 
        $fixed = $time->toDateString();

But that doesn't give the appropriate output i was wanted. means counted this saturday to friday. and calculate from database.can anyone sugges please?