I feel like a real bug on the forums lately lol. I just went through a round of antibiotics, and on day 7 out of 10, my mucus was slightly yellow in the morning and clear throughout the day. All my night time stats came back to normal level (temp, oxygen, breathing rate, and heart rate) and I was back in the treadmill and doing very well. Yesterday mucus was quite tinged in the morning (colour of putty and then deep yellow) and was light yellow all day (instead of the clear it had been with antibiotics). Today, same thing, I have a sore throat and slight ear ache, and last night I had a low grade fever, higher heart rate, and elevated breathing rate. I did go to our urgent care center yesterday. The doc said my breathing sounded okay, and I should go back in a few days if things don't get better. I went in the treadmill today and oxygen dipped to 93 with more minimal exertion. Could this be a secondary infection/flare up?