How can i Get record of First, Second, Third, Fourth Week from database

Please anyone help on how i can get weekly records from database using laravel.

I want to be able to get of each week saved into a variable...that is getting the four weeks in a moth in different records like below...

$week1 =  ProductStock:: //I need first week record
$week2 =  ProductStock:://I need second week record
$week3 =  ProductStock:://I need third week record
$week4 =  ProductStock:://I need third week record

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