Went to work and they sent me home

So some of you know that I have had broncitis and have been home sick from work for quite some time. My doctors note has me off till this Thursday but I felt a lot better today so I tried to go to work and they sent me home. Apparently you need a release to come back to work early from a doctors note to have to stay home sick. Who knew? I sure didn't, so I am back home and of course my doctor is out today so I can't get a note to go back to work till at least tomorrow. I just thought it was kind of funny I tried to go to work and got sent home.