That stinks. I don't know if where you work has an HR department. The CDC shortened quarantine though. They stay to stay home for 5 days when you get your positive (you did) and 5 days later, you can return if you are symptom free or they are decreasing. Perhaps wear a mask. I'd talk to your HR department or boss if this is acceptable to do. The guidelines are much more lenient now. Many have had covid or are vaccinated and the strains are milder. But that's between you and your employer for what you are comfortable with. I believe the new guideline reflects when you'd likely be most contagious.
This might not help if you have to sign out a week at a time, but when I had Covid, I tested positive for ten days and then tested entirely negative on day 11. Maybe you could test again sooner than next week and get back to work without missing the whole two weeks?