I had acl surgery about a week ago. my knee is hot to the touch, and it fells like its burning. is this bad?

in 16 and tore my acl playing soccer. my doctor told me i could start walking on it, but it hurts so bad i cant. but i need to get better befor my high school soccer season. it will be my jr year and i really dont want to sit out a season. i have absolutely no idea why my knee is hot. i go to the doctor monday, but i cant wait that long to figure out whats wrong with it. HELP!! thanks:)