I’d wait another 5 days at least. Think of it this way, they met you, they have seen your work, you have followed up so they know you want it… what purpose would another call have other than annoying them? I find the best way to solve for this kind of anxiety (I get it, it’s natural) it to apply for other jobs. Get a few more irons in the fire so all of your emotional energy is not attached to this working or not… and if you get an offer from another company before you hear back you follow up with a “Hi, just wanted to let you know I received an offer from your competitor. I’d prefer to work with you, but I need to give them an answer” . When I interviewed at Nike I already had offered from three of their competitors… I had an offer from the swoosh within 48 hours of leaving. Companies are competitive.