HI Aimless1,
As you’ve only had the product for one week, there will still be some “false firmness” in the mattress and it should soften a bit more in the next month or so. If possible, I’d recommend holding off on getting a topper or pad, just in case you don’t find it necessary after your new mattress has a more “broken-in” comfort that more accurately reflects what it will feel like moving forward. But if you have to add some comfort, there certainly are a myriad of offerings in mattress pads and toppers available.
Phoenix