The strep tests came back negative, but both my primary doctor and Beaumont hospital urgent care suspected it was probably still strep or a similar bacterial infection. I was tested for strep on Friday, and told that if I didn't improve in a couple days to start antibiotics. Long story short, I only got worse, so I started the antibiotics on Monday. They seem to have really helped, so I assume it did end up being strep or a similar bacterial infection. I'm not 100% better, but I'm way improved over how I was on Monday.