Sick Baby! Please help!

My daughter is one month old today, she usually has a very big appetite (3-4 ounces every two hours). Last night she didn't wake up at all for a bottle, she didn't even wake up to let us know she had peed. She is congested, she sounds hoarse, when I have her a 2 ounce bottle she barely touched it, and she can't really stay awake. We live with her great-grandmother and she has boarder line pneumonia. My baby has a check up on Thursday, should I wait until her appointment or call today and try to get her in today? I worry so much being a FTM, and I had RSV as a baby and I'm terrified she will get it.