I did my last injection 2 days ago in the quad. It hurts more than any injection i've ever done, I can't even walk. There's a knot in my leg and a red spot about 4 inches across(circular). I'm not seeing any streaks of red so far, but I fell like shit. My temperature has gone from normal this morning to 100 tonight. Could this be an infection? and if so, will I be alright waiting til tomorrow morning to go see the doc?