Two weeks is early days, your body has gone through a battle and needs to recover. Dont under estimate covid, it might be a bit of a cold symptom for some but for most it's not. If you're at work still and can't rest during the day, go to bed as early as possible, eat as healthy as you can and take vitamins to supplement your diet until you feel better.
I was still working and we had just gone into lockdown the first time I had it so could work from home. Second time was this Christmas so off work anyway, but no way would I have been able to go back after 5 days negative or not.Take time off to recover if you need to, you dont want it turning into long covid.