Hi,I ve caught a cold more than 3 weeks ago. I had low fever 99-100.4 for two weeks. 10 days ago, my doctor ordered the chest Xray, which showed that I developed bronchitis. So, I was on Zpak for 5 days, and inhaler. The fever got better for a couple of days 10 days after Zpak. But I found that the temperature is unstable recent two days. It can reach 99.5 when I move around. Does this mean that the Zpak isn t working well?